Q. $co s^{2} \frac{π}{12} co s^{2} \frac{π}{4} co s^{2} \frac{5 π}{12}$

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A

$\frac{3}{2}$

B

$\frac{3 - 3}{2}$

C

$\frac{2}{3}$

D

$\frac{2}{3 + 3}$

Solution:

Correct answer is (b) $\frac{3 - 3}{2}$