# What is the derivative of #f(x)=2cosx-cos2xdx#?

##### 1 Answer

Oct 29, 2015

#### Explanation:

Note that

#d/(dx)(2cos x - cos 2x)= 2d/(dx)(cosx )-d/(dx)(cos 2x)#

#=-2sin x+2sin 2x#

Since

Oct 29, 2015

Note that

#d/(dx)(2cos x - cos 2x)= 2d/(dx)(cosx )-d/(dx)(cos 2x)#

#=-2sin x+2sin 2x#

Since

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