Question

# Find derivatives for the functions. Assume a, b, c, and k are constants. W(t)=r^{2}\cos r

Derivatives
Find derivatives for the functions. Assume a, b, c, and k are constants.
$$\displaystyle{W}{\left({t}\right)}={r}^{{{2}}}{\cos{{r}}}$$

$$\displaystyle{W}'{\left({r}\right)}={\left({r}^{{{2}}}{\cos{{r}}}\right)}'$$
$$\displaystyle={\left({r}^{{{2}}}\right)}'{\cos{+}}{r}^{{{2}}}{\left({\cos{{r}}}\right)}'$$
$$\displaystyle={2}{r}{\cos{{r}}}-{r}^{{{2}}}{\sin{{r}}}$$