# Is #f(x)=cosx*tanx-sinx# increasing or decreasing at #x=pi/6#?

##### 1 Answer

Apr 16, 2016

f(x) = 0, a constant, for all x.

#### Explanation:

If

If

In any case, f(x) =0.

Here, h(x) = cos x, g(x) = sin x and a= an odd multiple of