cosA/1+sinA=1-sinA/cosA
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LHS = cosA / 1+sinA
= cosA (1-sinA) / (1+sinA)(1-sinA)
= cosA (1-sinA) / 1-sin^2A
= cosA (1-sinA) / cos^2A
= 1-sinA /cosA
RHS = 1-sinA / cosA
LHS = RHS
= cosA (1-sinA) / (1+sinA)(1-sinA)
= cosA (1-sinA) / 1-sin^2A
= cosA (1-sinA) / cos^2A
= 1-sinA /cosA
RHS = 1-sinA / cosA
LHS = RHS
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