Q8 of 90 Page 8

Prove that:

Take R.H.S:










= tan θ


= R.H.S


Hence Proved


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8

Prove that:

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Prove that:

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Prove that:

i.


ii. cos (A + B + C) + cos (A – B + C) + cos (A + B – C) + cos (-A + B + C) = 4 cos A cos B cos C

 10

prove that