Q. $2 + 2 + 2 + 2 cos 8 θ =$

649 200 KCETKCET 2022Trigonometric Functions Report Error

A

$sin 2 θ$

14%

B

$2 sin θ$

28%

C

$2 cos θ$

42%

D

$2 cos \frac{θ}{2}$

16%

Solution:

$1 + cos θ = 2 cos^{2} (\frac{θ}{2})$
$2 + 2 + 2 + 2 cos 8 θ = 2 cos θ$