\begin{aligned} &1 \text { suppose } f(\pi / 3)=4 \text { and } f^{\prime}(\pi / 3)=-2, \text { and let } g(x)=f(x) \sin x \text { and }\\ &h(x)=(\cos x)

/ f(x) \text { . Find } \end{aligned} \text { a. } g^{\prime}(\pi / 3) \text { b. } h^{\prime}(\pi / 3)