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Question: The values of x for which 2x<sup>4</sup>£ cos<sup>6</sup> x + sin<sup>4</sup>x – 1 is/are –...

The values of x for which 2x4£ cos6 x + sin4x – 1 is/are –

A

(π4,0)\left( \frac{\pi}{4},0 \right)

B

(–1, 1)

C

{π4}\left\{ \frac{\pi}{4} \right\}

D

{0}

Answer

{π4}\left\{ \frac{\pi}{4} \right\}

Explanation

Solution

Only option (3) satisfies