Which choice of will most directly lead to an elementary antiderivative for the integral ?

MATHEMATICS · Single correct · CBSE · Mathematics · Integrals · Integrals

Problem

Which choice of

u

will most directly lead to an elementary antiderivative for the integral

\displaystyle \int \cos(4x)\,dx

? (a)

u = \cos(4x)

(b)

u = \dfrac{x}{4}

(c)

u = 4x

(d)

u = x