How to prove 1+cos A= sin²A/ 1-cos A??
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⇒1+cos A
multiplying and dividing by sin²A
=(sin²A ( 1+cos A))/sin² A
=(sin²A (1+cos A))/( 1-cos²A)
=(sin²A (1+cos A))/((1- cos A)(1+cos A))
=sin²A/ ( 1- cos A)
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