Verify the identity

tan x/sec x-1=sec x+1/tan x

Verify
cos(360 degrees-x)=cos x

Solve
4cos^3x-3cosx=0 for 0 less than or equal to x<2pi

I think all 4 of your questions should be combined - and you should also state the question, not command "solve."

Originally posted by Eribug19

tan x/sec x-1=sec x+1/tan x

Verify the identity

Hi, Eribug19!

Are you looking for a direct answer to the problem, or for someone to come along and teach you how to come up with the correct answer yourself, please?

If the former is true, please click on the following link to read the announcement there.

https://www.askmehelpdesk.com/math-sciences/announcement-font-color-ff0000-u-b-read-first-expectations-homework-help-board-b-u-font.html

Thanks!

Solve: 4cos^3x-3cosx=0 for 0 less than or equal to x<2pi

Solve

Hi again, Eribug19!

This isn't some Univac computer where people just plug in their questions and expect an answer to pop out. People give freely of their time here to help people. It would help if you would show some initiative as to what you've already done to come up with the correct answer yourself. If you do that, you'll be more likely to have someone knowledgeable come along to tell you whether what you've done is and if not, willing to teach you how to come up with the correct answer yourself.

Again, please click on the following link.

https://www.askmehelpdesk.com/math-sciences/announcement-font-color-ff0000-u-b-read-first-expectations-homework-help-board-b-u-font.html

Thanks!

All threads merged.

We do not do your homework for you here.

If you want help with your homework, please specify the help you need.

Your posts were merged.

It would be good if you showed us what you attempted.

You should keep in mind the basic identities that you know to solve these problems, especially:

tan A = \frac{sinA}{cosA}

secA = \frac{1}{cosA}

tan^2A + 1 = sec^2A

cos(A\pm B) = cosAcosB \mp sinAsinB

For the last one

4cos^{3}(x)-3cos(x)=0

Let u=cos(x)

Then, you get a cubic that can be easily solved. Solve it and resub.

4u^{3}-3u=0

u(4u^{2}-3)=0

Finish?