Find the nnn-th derivative of f(x)=sinxf(x) = \sin xf(x)=sinx.
sin(x+nπ2)\sin\left(x + \frac{n\pi}{2}\right)sin(x+2nπ)
nsinxn\sin xnsinx
sin(nx)\sin(nx)sin(nx)
(−1)nsinx(-1)^n\sin x(−1)nsinx