Q. $2 + 2 + 2 + 2 cos 8 θ =$

538 182 KCETKCET 2022Trigonometric Functions Report Error

A

$sin 2 θ$

15%

B

$2 sin θ$

33%

C

$2 cos θ$

33%

D

$2 cos \frac{θ}{2}$

18%

Solution:

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