If , then is equal…

MATHEMATICS · Single correct · CBSE · Mathematics · Inverse Trigonometric Functions · Inverse Trigonometric Functions

Problem

If

4\sin^{-1}x+\cos^{-1}x=\pi

, then

x

is equal to (a)

0

(b)

\frac{1}{2}

(c)

-\frac{\sqrt{3}}{2}

(d)

\frac{1}{\sqrt{2}}

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