Prove that cos1degree cos 2 degree ...................... cos 180degree = 0
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cos1°cos2°......cos180°
=cos1°cos2°.........cos89°cos90°cos91°......cos179°cos180°
=0 [∵, cos90°=0]
=cos1°cos2°.........cos89°cos90°cos91°......cos179°cos180°
=0 [∵, cos90°=0]
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