Prove without using trigonometric table :cos1.Cos2.Cos3...........Cos180=0
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as there is an there is one of the angle call cos 90 where the value of cos 90 is zero and the question is about multiplying cos 1 cos 2 cos 3 cos 4 cos 5 up to cos 180 which includes cos 90 degree also the value of cos 90 is zero the answer is zero at last thankyou lhs is equal to RHS
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