Let f $($x$)=4$ sin$(4$x$)1.$ R$($a$)(10$ points$)$ Use a Riemann sum with n $=4$ to approximate f $($x$)$dx$\mathrm{.}0$Use the right endpoints of each interval.$($b$)(10$ points$)$ Use u$-$substitution to find an antiderivative of f $($x$).$R$($c$)(5$ points$)$ Compute the exact value off $($x$)$dx$\mathrm{.}0$