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2015-10-01T12:27:45+05:30

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multiply LHS  by    cos + (1- sin )    in numerator and denom.

LHS = (cos² + 1 + sin² - 2 sin + 2 cos - 2 cos sin) / (cos² - 1 - sin² + 2 sin)
       = (1 - sin + cos - sin cos)/ (sin - sin²)
       = (1 - sin) (1+cos)/(1- sin)sin
       = cosec + cot


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