Find the derivative of f(x)=6cos(x)f(x) = 6 \cos(x)f(x)=6cos(x).
6sin(x)6 \sin(x)6sin(x)
−6sin(x)-6 \sin(x)−6sin(x)
6cos(x)6 \cos(x)6cos(x)
−6cos(x)-6 \cos(x)−6cos(x)