CBSE Class 11-science Answered
if A+B+C=180 , PROVE THAT :
cos.cos A + cos.cos B + cos.cos C = 1-2cosAcosBcosC
Asked by Aashna Anith Kumar | 01 Jul, 2013, 08:43: PM
Expert Answer
Answered by | 01 Jul, 2013, 10:01: PM
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