|
|
|
|
New Member
|
|
May 6, 2009, 09:46 AM
|
|
solve sin(2x)=1/2
I really don't know, can someone help me...
|
|
|
Uber Member
|
|
May 6, 2009, 10:08 AM
|
|
simple algebra:
This will give you the lowest value of x. You need to remember that there are in fact an infinite number of values for x, as the graph at the bopttom of the post shows. Each of my lines shows the positions of solutions to sin(2x) = 1/2 between 0 and 10. Working them out should be fairly trivial.
Let me know if you need more help!
|
|
|
New Member
|
|
May 6, 2009, 10:37 AM
|
|
Originally Posted by Capuchin
simple algebra:
This will give you the lowest value of x. You need to remember that there are in fact an infinite number of values for x, as the graph at the bopttom of the post shows. Each of my lines shows the positions of solutions to sin(2x) = 1/2 between 0 and 10. Working them out should be fairly trivial.
Let me know if you need more help!
you insane?? You can't multiply or divide with sin!!
this is the solution
sin(2x)=1/2
{sin(30°)=1/2}
sin(2x)=sin(30°)
2x=30°
x=15°
|
|
|
New Member
|
|
May 6, 2009, 10:40 AM
|
|
Graphic side is OK, but nul points aren't asigned so I can only assume what are they
|
|
|
Uber Member
|
|
May 6, 2009, 10:44 AM
|
|
Originally Posted by Hexial
you insane??? you can't multiply or divide with sin!!!
this is the solution
sin(2x)=1/2
{sin(30°)=1/2}
sin(2x)=sin(30°)
2x=30°
x=15°
Hey, be polite at least!:mad: Some people are trying to help, and they may have their own methods. You don't have to criticize other's methods, since you yourself couldn't solve the problem earlier.
|
|
|
Uber Member
|
|
May 6, 2009, 10:57 AM
|
|
I wasn't dividing by sin, i was using the inverse sin operator on both sides, where . This is perfectly acceptable, and all scientific calculators have this function.
Also, the graph wasn't for you to read off the answer, it was to show you that there are an infinite number of values of 2x. Your answer gives only one of them (and i point out that your solution is the same as mine!).
|
|
|
New Member
|
|
May 6, 2009, 02:13 PM
|
|
Originally Posted by Unknown008
Hey, be polite at least!:mad: Some people are trying to help, and they may have their own methods. You don't have to criticize other's methods, since you yourself couldn't solve the problem earlier.
True... my apologies, I bumped into the solution after some time...
|
|
|
New Member
|
|
May 6, 2009, 02:16 PM
|
|
Originally Posted by Capuchin
I wasn't dividing by sin, i was using the inverse sin operator on both sides, where . This is perfectly acceptable, and all scientific calculators have this function.
Also, the graph wasn't for you to read off the answer, it was to show you that there are an infinite number of values of 2x. Your answer gives only one of them (and i point out that your solution is the same as mine!).
so you're saying that [ sin(x) / sinx ] = x? Don't know man, this is the fist time i see smth like this...
|
|
|
New Member
|
|
May 6, 2009, 02:17 PM
|
|
[ sin(x) / sin ] =x
sorry, not used to write sin all alone...
|
|
|
New Member
|
|
May 6, 2009, 02:46 PM
|
|
you used the arc function... sin^(-1) = arc
I used the same function in my 3rd step...
both our solutions are correct...
and I would like to apologise to you for calling you insane, sorry ,)...
|
|
|
Uber Member
|
|
May 6, 2009, 03:49 PM
|
|
generally, ^(-1) of a function implies the inverse of the function. For example if f(x) = 2(x^2) then f^-1(x) = (1/2x)^0.5. not simply 1/f(x)
You need to recognise the other solutions, x=pi/12 isn't the only answer. You don't have a complete solution yet.
|
|
Question Tools |
Search this Question |
|
|
Check out some similar questions!
How can I solve
[ 1 Answers ]
I have a mp4 player and every time I turn it on it say insert usb line to use usbdisk then it say press any key to restart but it don't do any thing and when I do use the usb line it say format I hit format and it say usb disk after its done formatting
How to solve this?
[ 1 Answers ]
An empty 240 kg elevator accelerates upward
At 1.4 m/s2.
The acceleration of gravity is 9.8 m/s2 .
What is the tension in the cable that lifts
The elevator cab? Answer in units of N.
Can someone solve these for me?
[ 2 Answers ]
Decomposition
Complete and balance the following equations:
1.MgCO3 ---> +
2.HgO ---> +
3. PCl5 ---> +
4. (NH4)2Cr2O7 ---> + + N2
5. CuO ---> +
View more questions
Search
|