Friday

January 30, 2015

January 30, 2015

Posted by **Mary** on Wednesday, March 20, 2013 at 4:42pm.

f(cos x) if f'(x)= 1/x

find (f(cos x))'

i got tan x sec x

this is wrong.

please explain. thank you

- Derivative -
**Steve**, Wednesday, March 20, 2013 at 5:18pmif f'(x) = 1/x

f(cos x)' = 1/cosx * -sinx = -tanx

**Answer this Question**

**Related Questions**

Integration - Intergrate ¡ì sec^3(x) dx could anybody please check this answer. ...

Derivatives - with respect to x f(cos x) if f'(x)= 1/x find (f(cos x))' i got ...

Calculus 12th grade (double check my work please) - 1.)Find dy/dx when y= Ln (...

MATH - Hi, I really need help with these questions. I did some of them halfway, ...

Trigonometry desperate help, clueless girl here - 2. solve cos 2x-3sin x cos 2x...

Trigonometry - 1.Solve tan^2x + tan x – 1 = 0 for the principal value(s) to two ...

Trig - Given: cos u = 3/5; 0 < u < pi/2 cos v = 5/13; 3pi/2 < v < ...

Trigonometry - Please review and tell me if i did something wrong. Find the ...

precalculus - For each of the following determine whether or not it is an ...

Mathematics - Trigonometric Identities - Let y represent theta Prove: 1 + 1/tan^...