If sin β is the GM between sin a and cos a, then cos 2β is e... | Mathematics | SolveeIt

If sin β is the GM between sin a and cos a, then cos 2β is equal to

$2sin^2=(\frac{\pi}{4}-a)$

$2cot^2=(\frac{\pi}{4}-a)$

$2cos^2=(\frac{\pi}{4}-a)$

$2sin^2=(\frac{\pi}{4}+a)$

Answer

$2sin^2=(\frac{\pi}{4}-a)$

Explanation

The correct answer is(A): $2sin^2=(\frac{\pi}{4}-a)$

Mathematics Question on Trigonometric Equations