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Questions and answers by
Ghatak Buddy
Answers (1)
-2/3 proof: 1. observe symmetry in A and B 2. Square each equation after sending terms of A/B on other side. We can prove: SinA + CosA= 1/2 and SinB +CosB=1/2 3. bring equations in form of tan's by dividing CosA and then using SecA to TanA formulae. 4.
