Chapter 2 - Derivatives - 2.5 The Chain Rule - 2.5 Exercises - Page 160: 87

$θ°$ =$(\frac{\pi}{180})θ$ $rad$ $\frac{d}{dθ}(sinθ°)$ = $\frac{d}{dθ}(sin{\frac{\pi{θ}}{180}})$ $\frac{d}{dθ}(sinθ°)$ = ${\frac{\pi}{180}}(cos{\frac{\pi{θ}}{180}})$ $\frac{d}{dθ}(sinθ°)$ = ${\frac{\pi}{180}}(cosθ°)$

$θ°$ =$(\frac{\pi}{180})θ$ $rad$ $\frac{d}{dθ}(sinθ°)$ = $\frac{d}{dθ}(sin{\frac{\pi{θ}}{180}})$ $\frac{d}{dθ}(sinθ°)$ = ${\frac{\pi}{180}}(cos{\frac{\pi{θ}}{180}})$ $\frac{d}{dθ}(sinθ°)$ = ${\frac{\pi}{180}}(cosθ°)$