cos^a+cos^b+cos^c=1-2cosa.cosb.cosc
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Please use image, i may ur question is wrong
now im using rhs
1-2cosa.cosb.cosc
1-cosc(cos(a-b)+cos(a+b))
1-cosc.cos(a-b)-cosc.cos(a+b)
1
now im using rhs
1-2cosa.cosb.cosc
1-cosc(cos(a-b)+cos(a+b))
1-cosc.cos(a-b)-cosc.cos(a+b)
1
lucky80:
aba oo proof karna hai
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