Q10 of 90 Page 8

prove that

Given,











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8

Prove that:

 9

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

 11

12

If sin 2A = λ sin 2B, prove that: