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in Trigonometry by (46.9k points)
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(1 + cos π/8)(1 + cos 3π/8)(1 + cos 5π/8) (1 + cos 7π/8) = .....

(a) 1/8

(b) 0

(c) 9/7

(d) 5

1 Answer

+1 vote
by (49.1k points)
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Best answer

(a) 1/8

LHS 

= (1/4) x (1/2) = 1/8

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