# Math Help - chain rule help

1. ## chain rule help

How do i use the chain rule to show that

d/dx (sin(x)) = (pi/180)*cos(x)

x is measured in degrees.

Any help appreciated!

2. Originally Posted by amma0913
How do i use the chain rule to show that

d/dx (sin(x)) = (pi/180)*cos(x)

x is measured in degrees.

Any help appreciated!

Well, as $\pi rad.=180 degrees$ , using d to denote degree we get that $d = \frac{\pi}{180}rad.$, so $\sin{x deg.}=\sin{\frac{\pi}{180}x rad}$
Take it from now rememebring that $\frac{d\sin{x}}{dx}=\cos{x}$ WHEN X is measured in radians!

Tonio