cos1°×cos2°×cos3°....... cos179°=
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cos 1 × cos 2 × cos 3 × ......× cos 179
= cos 1 × cos 2 × cos 3 × .....× cos 90 × ..... × cos 179
= cos 1 × cos 2 × cos 3 × .....× 0 × ..... × cos 179
= 0 × cos 1 × cos 2 × cos 3 × ....... × cos 179
= 0
= cos 1 × cos 2 × cos 3 × .....× cos 90 × ..... × cos 179
= cos 1 × cos 2 × cos 3 × .....× 0 × ..... × cos 179
= 0 × cos 1 × cos 2 × cos 3 × ....... × cos 179
= 0
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