cos 1° cos 2° cos 3º... cos 180º = 0
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Step-by-step explanation:
L.H.S.
cos1°.cos2°.cos3°......cos180°
=cos1°×cos2°×cos3°×.....×cos90°×.....cos180°
=cos1°×cos2°×cos3°×.....×0×.....cos180° [As cos90°=0]
=0
=R.H.S.
Hence Proved.
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