Q. $co s^{2} \frac{π}{16} + co s^{2} \frac{3 π}{16} + co s^{2} \frac{7 π}{16} =$

1881 238 Odisha JEEOdisha JEE 2008Trigonometric Functions Report Error

A

$0$

B

$1$

C

$2$

D

$3$

Solution:

Correct answer is (c) $2$