sinA/(1+cosA) = tan (1/2)A ? Let tan (1/2)A = tanx then we can write our equation as sin 2x/(1 + cos 2x) = tanx LS = 2sinxcosx/(sin^x + cos^2x + cos^2x - sin^2x) = 2 sinxcosx/2cos^2x = sinx/cosx = tanx = RS
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