Prove the following identities:
1.) 2Cos^2θ - 1 = 1 - 2Cos^2θ
2.) (Sin A + Cos A)^2 = 1 + 2 Sin^2θ Cosθ
3.) Sin θ Cos θ = (Cot θ / 1 + Cos^2 θ)
4.) (1 - Cot^2θ / 1 + Cot^2θ) = 1 - 2Cos^2θ
5.) (Cot A / Cosec A -1) - (Cos A / 1 + Sin A)?
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Asked by Alex on 14th July, 2021
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