Chapter 3 - Determining Change: Derivatives - 3.2 Activities - Page 210: 19

$f'(t)=-0.07$ $sin$ $t-4.7$ $cos$ $t$

We solve this problem by implementing two rules for trigonometry functions, first we use: $\frac{d}{dx}(cos$ $x)$ $=$ $-sin$ $x$. Then we implement the other rule: $\frac{d}{dx}(sin$ $x)$ $=$ $cos$ $x$.