A Level

MATHEMATICS · Single correct · A Level · Mathematics · Integration · Integration

Problem

\int \frac{\sin 2x}{\sin^4 x+\cos^4 x}\,dx

is equal to (a)

\cot^{-1}(\cot^2 x)+c

(b)

-\cot^{-1}(\tan^2 x)+c

(c)

\tan^{-1}(\tan^2 x)+c

(d)

-\tan^{-1}(\cos 2x)+c