Given that , find and show that

Please help. I have tried to use the two trig calculus rules that I know but I can't seem to get them to work.

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- June 27th 2009, 09:08 AMgreghunterDifferentiation of trigonometry equations
Given that , find and show that

Please help. I have tried to use the two trig calculus rules that I know but I can't seem to get them to work. - June 27th 2009, 09:31 AMPlato
We know that .

- June 27th 2009, 09:36 AMSoroban
Hello, Greg!

You must be differentiating incorrectly . . .

Quote:

Given that: . , .find

and show that: .

We have: .

Therefore: .

- June 27th 2009, 10:28 AMgreghunter
Can you tell me how you got from cos2x to -2sin2x?

I know that cosx = -sinx but the 2x confused me - June 27th 2009, 11:16 AMAmer
chain rule

- June 27th 2009, 02:49 PMgreghunter