prove that
cosec a - 1 / cosec a + 1 = cos a / 1 + sin a whole square
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Step-by-step explanation:
cosecA-1/cosecA+1=1-sinA/1+sinA ×1+sinA/1+sinA
=1-sin²A/(1+sinA)²
=cos²A/(1+sinA)²
={cosA/(1+sinA)}²
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