(1 + cos(π)/8 ) (1 + cos(3π)/8 ) (1 + cos(5π)/8 ) (1 + cos(7π)/8 ) is equal to

(1 + cos(π)/8 ) (1 + cos(3π)/8 ) (1 + cos(5π)/8 ) (1 +… — JEE Main 1984 Mathematics PYQ

1984

\left(1 + \cos\dfrac{\pi}{8}\right)\left(1 + \cos\dfrac{3\pi}{8}\right)\left(1 + \cos\dfrac{5\pi}{8}\right)\left(1 + \cos\dfrac{7\pi}{8}\right)

is equal to

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Correct option: C

[1984]

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