1+sinA. 1- sinA/1+cosA.1-cosA

1.	1+sinA. 1- sinA/1+cosA.1-cosA
Answer» 1+sinA×1-sinA/1+cosA×1-cosA=1^2-sin^2/1^2-cosA^2 by ((a+b)(a-b)=a^2-b^2) then cos^2A/sin^2A=cot^2A hence 1+sinA×1-sinA/1+cosA×1-cosA=cot2A Me to

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