If sin0 + sin20 = 1. …

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If sin0 + sin20 = 1. Prove that cos20 + cos40 =1

Posted by Abhay Jaiswal 6 years, 9 months ago

CBSE > Class 10 > Mathematics

1 answers

A S 6 years, 9 months ago

sin0=1-sin20 sin0=cos20 now LHS= cos20 +cos40 cos20+(cos20)2 cos20+sin20=1 =RHS

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