2 is not equal to - Vidyadip

MCQ

$\cos 2 \theta$ is not equal to

A
$2 \cos ^2 \theta-1$
B
$1-2 \sin ^2 \theta$
✓
$\frac{1+\tan ^2 \theta}{1-\tan ^2 \theta}$
D
$\frac{1-\tan ^2 \theta}{1+\tan ^2 \theta}$

✓

Answer

Correct option: C.

$\frac{1+\tan ^2 \theta}{1-\tan ^2 \theta}$

(C)
$\cos 2 \theta=2 \cos ^2 \theta-1$
$=1-2 \sin ^2 \theta$
$=\frac{1-\tan ^2 \theta}{1+\tan ^2 \theta}$

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