that Sin A + Cos A / Sin A minus Cos A + Sin A minus Cos A divided by sin a + Cos A equals 2 by 1 - 2 cos square A
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= sin² a + cos²a+2 sin a.cos a+sin²a+cos²a-2sin a.cos a/sin²a-cos²a
=2/sin²a-cos²a =2/sin²a-cos²a
= 2/1-2cos²a
=2/sin ²a+cos²a-2cos²a =2/sin²a-cos²a
LHS =RHS
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