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