# Math Help - Derivative of trigonometric function

1. ## Derivative of trigonometric function

y = 6 sin (4 TTx)

(TT = pi)

2. $y = k\sin(u)$ , where $u$ is a function of $x$ ...

$\frac{dy}{dx} = k\cos(u) \cdot \frac{du}{dx}$

3. dy/dx= (6 cos(4TTx))(4TT) ?

$\frac{dy}{dx} = 24\pi \cos(4\pi x)$