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Type: Posts; User: thinay

1. Question: Problems in tangents and normals

by thinay
Answers
2
Views
667

Ok I got it! Thanks! But how about in the next...

Ok I got it! Thanks! But how about in the next problem? Wherein there are 2 answers? :(
2. Question: How to prove this?

by thinay
Answers
4
Views
980

Wait.. The question in the first problem is that...

Wait.. The question in the first problem is that I need to show that in the first 48ft rise of the body, it has lost one-half of its velocity..
3. Question: How to prove this?

by thinay
Answers
4
Views
980

Ok! I knew now how to solve it.. thanks! :)

Ok! I knew now how to solve it.. thanks! :)
4. Question: How to prove this?

by thinay
Answers
4
Views
980

how to prove this?

Please help in this problem.. Here's the problem:
A body rises vertically from earth according to the law S= 64t - 16t^2. In here, I need to show or prove that it has lost one-half its velocity in...
5. Question: Problems in tangents and normals

by thinay
Answers
2
Views
667

Problems in tangents and normals

Please help me find the solutions in the problems below. I will really appreciate any help. Here it goes...

In the first problem, find the equation of the line to the ff. conics at the given...
6. Question: Miscellaneous problems in derivatives of trigonometric functions

by thinay
Answers
22
Views
1,702

Sure! No problem with me.. :)

Sure! No problem with me.. :)
7. Question: Miscellaneous problems in derivatives of trigonometric functions

by thinay
Answers
22
Views
1,702

Oh.. I see.. I'll be the one to get the second...

Oh.. I see.. I'll be the one to get the second derivative.. thanks for the help.. Again and again.. :D
8. Question: Miscellaneous problems in derivatives of trigonometric functions

by thinay
Answers
22
Views
1,702

Actually not.. its solution is very long.. and I...

Actually not.. its solution is very long.. and I get confused because of that.. I will go back to the very start and review my solution.. In the end, I end up with nothing.. Still confused on how to...
9. Question: Miscellaneous problems in derivatives of trigonometric functions

by thinay
Answers
22
Views
1,702

wait... wait... last one.. I hope you can help me...

wait... wait... last one.. I hope you can help me in this one.. :D

in here, not just finding the dy/dx.. but also the d^2y/dx^2..

here it goes..
y= sqrt of ((1-cos4x)/(1+cos4x))
the answer...
10. Question: Miscellaneous problems in derivatives of trigonometric functions

by thinay
Answers
22
Views
1,702

Oh.. I see.. tan^2(x+y) is same as (tan(x+y))^2.....

Oh.. I see.. tan^2(x+y) is same as (tan(x+y))^2.. So, when you break it down that will become (tan(x+y))(tan(x+y)). Since y=tan(x+y)... that will be (y)(y)=y^2..

I get it.. :D
11. Question: Miscellaneous problems in derivatives of trigonometric functions

by thinay
Answers
22
Views
1,702

great! :D hmmm.. I just want to know how...

great! :D
hmmm.. I just want to know how
-1/tan^2(x+y) - 1 become -1/y^2 - 1... :)
12. Question: Miscellaneous problems in derivatives of trigonometric functions

by thinay
Answers
22
Views
1,702

haha.. okey! Thanks for the help! Forget about...

haha.. okey! Thanks for the help!
Forget about that 'sir' thing.. :D

I know there's a person here who knows that -(1+y^-2). :)
13. Question: Miscellaneous problems in derivatives of trigonometric functions

by thinay
Answers
22
Views
1,702

haha.. okey! Thanks for the help! :D I know...

haha.. okey! Thanks for the help! :D

I know there's a person here who knows that -(1+y^-2). :)
14. Question: Miscellaneous problems in derivatives of trigonometric functions

by thinay
Answers
22
Views
1,702

Ok! I got it.. I need to expand that to get the...

Ok! I got it.. I need to expand that to get the correct answer..

After few minutes, your mouse will start to work again. Be positive. :D

OK sir.. next number 4.. :)
15. Question: Miscellaneous problems in derivatives of trigonometric functions

by thinay
Answers
22
Views
1,702

Oh no.. I mean I got the correct answer in number...

Oh no.. I mean I got the correct answer in number 3 and not in number 2. :)
16. Question: Miscellaneous problems in derivatives of trigonometric functions

by thinay
Answers
22
Views
1,702

I already got the correct answer in number 2! :D

I already got the correct answer in number 2! :D
17. Question: Miscellaneous problems in derivatives of trigonometric functions

by thinay
Answers
22
Views
1,702

Ah.. ok! Now I know what's wrong with my answer...

Ah.. ok! Now I know what's wrong with my answer in number 1.. My derivative of xsinx is xcosx.. it should be xcosx + sinx..

I got it! Let's proceed to the next number.. :)
18. Question: Miscellaneous problems in derivatives of trigonometric functions

by thinay
Answers
22
Views
1,702

miscellaneous problems in derivatives of trigonometric functions

please help me solve the problems below. As always, I end up with incorrect answers in some items of my reviewer. Here it is: find dy/dx

1.) y= xsinx + (1-1/2 x^2)cosx
Ans: 1/2 x^2 sinx
my ans:...
19. Question: Derivatives of trigonometric functions

by thinay
Answers
4
Views
545

Oh.. I see.. my answer is correct which is...

Oh.. I see.. my answer is correct which is 1-cos2x/2.. I just need to simplify it to get sin^2x..

In #2, the answer that I got is sec^2 1/2 x.. Its wrong.
20. Question: Derivatives of trigonometric functions

by thinay
Answers
4
Views
545

derivatives of trigonometric functions

please help me with this... :) Thanks in advance! When I tried to answer this last two numbers, the answer in the book with mine. And I think my answers are wrong. Here it is:

1.) y = 1/2 x - 1/4...
21. Question: Derivatives (differentitation of algebraic function)

by thinay
Answers
7
Views
2,603

Ah.. I see.. the answer in the book is already...

Ah.. I see.. the answer in the book is already simplified. Tnx! :)
22. Question: Derivatives (differentitation of algebraic function)

by thinay
Answers
7
Views
2,603

... but according to the book where we take our...

... but according to the book where we take our test the answer in number 4 is this:
-1/(1+x)(sqrt of 1-x^2)
23. Question: Derivatives (differentitation of algebraic function)

by thinay
Answers
7
Views
2,603

when I tried solving the 4 items, Ive got the...

when I tried solving the 4 items, Ive got the correct answer in #s 1 and 2. But in #s 3 and 4, I end up with wrong answers. :( I think my solutions are wrong.

Here's my answer that I got:
3.) ...
24. Question: Derivatives (differentitation of algebraic function)

by thinay
Answers
7
Views
2,603

Derivatives (differentitation of algebraic function)

hello. Can anyone please help me in these problems.. :) Our prof gave us a long test a day ago.. but sad to say I failed to answer the 4 items in that test. Our prof gave the answers after the test...
25. Question: Topic: infinite limits

by thinay
Answers
19
Views
764

Okey! I'm totally done! :D Thank you very much...

Okey! I'm totally done! :D
Thank you very much for your help!

I need to sleep now. Its already 11pm here in our country.

Hope you can help me again next time! Thanks! More powers! ;)
26. Question: Topic: infinite limits

by thinay
Answers
19
Views
764

Hey! I've tried to substitute the value of x to...

Hey! I've tried to substitute the value of x to g(x)= x/(x-5)..

if..
g(6) = 6
g(7) = 3.5
g(8) = 2.67
g(9) = 2.25
g(10) = 2

am I correct? :D
27. Question: Topic: infinite limits

by thinay
Answers
19
Views
764

Nope! I have read his/her post and I'm just...

Nope! I have read his/her post and I'm just confused what really the answer is. Because the other one says that the answer is - and the other says that its +.
That's it! :)
28. Question: Topic: infinite limits

by thinay
Answers
19
Views
764

My answer is wr0ng! :DD It should be - infinity..

My answer is wr0ng! :DD
It should be - infinity..
29. Question: Topic: infinite limits

by thinay
Answers
19
Views
764

Ok! Ok! I'll do that. :) Hey! :D What do you...

Ok! Ok! I'll do that. :)

Hey! :D What do you think in this problem? Is it positive or negative infinity?
lim (x/x+2) + (1/x^2-4)
x->-2^+

when I tried to answer it. I end with + infinity.
30. Question: Topic: infinite limits

by thinay
Answers
19
Views
764

Ok! Ok! I'll do that. :) Hey! :D What do you...

Ok! Ok! I'll do that. :)

Hey! :D What do you think in this problem? Is it positive or negative infinity?
lim (x/x+2) + (1/x^2-4)
x->-2^+

when I tried to answer it. I end with + infinity.
31. Question: Topic: infinite limits

by thinay
Answers
19
Views
764

Oh! I see. Thanks a lot! :D

Oh! I see. Thanks a lot! :D
32. Question: Topic: infinite limits

by thinay
Answers
19
Views
764

Thank you for your help! Clap! Clap! Clap! :D ...

Thank you for your help! Clap! Clap! Clap! :D

wait. To get the values close to the asymptote.. Am I just going to substitute the value of x..

example: g(x) = (5.01)/(5.01-5)
is this correct?...

by thinay
Answers
19
Views
764

Is x=5?? :D
34. Question: Topic: infinite limits

by thinay
Answers
19
Views
764

Wait. I want to know first if my answer 5/0 =...

Wait. I want to know first if my answer 5/0 = positive infinity correct? :)
35. Question: Topic: infinite limits

by thinay
Answers
19
Views
764

Topic: infinite limits

Can anyone help me with this problem. :)

The given is: g(x) = x/(x-5) and I need to find the vertical asymptote of the graph of g and the sketch of the graph of g for values close to the...
36. Question: Topic is about Limits

by thinay
Answers
4
Views
462

Oh.. Stupid me. :D now I know my mistake. When I...

Oh.. Stupid me. :D now I know my mistake. When I add square root of 7.. The answer that I got was square root of 14.

I forgot that there is invisible 1 before square root of 7. What I did was I...
37. Question: Topic is about Limits

by thinay
Answers
4
Views
462

I end up with an answer: 1/square root of 14 ...

I end up with an answer:
1/square root of 14

Is my answer correct? Because the hand out that was given to us tells that the answer is (square root of 7)/14.

How did they get that answer? There...
38. Question: Topic is about Limits

by thinay
Answers
4
Views
462

Topic is about Limits

Can anyone help me in my problem again? Here's my problem in limits:

Lim ((Square root of 7 + a) - square root of 7) over a
a->0

Hope you can help me. Thanks in advance. :)
39. Question: Ellipse and hyperbola

by thinay
Answers
2
Views
645

Thanks for your help galactus! :)

Thanks for your help galactus! :)
40. Question: Ellipse and hyperbola

by thinay
Answers
2
Views
645

ellipse and hyperbola

The equation of a hyperbola is like this:
x^2/a^2 - y^2/b^2 = 1

my problem is this.. I don't know what am I going to do with this equation > 4x^2 - y^2 = 4y
to become same as the equation...
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