if cotA=15/8,evaluate:(2+2sinA)(1-sinA)/(1+cosA)(2-2cosA)
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(2+2sinA)(1-sinA)/(1+cosA)(2-2cosA)
= {2(1+sinA)(1-sinA)}/{2(1+cosA)(1-cosA)}
= (1-sin^2A)/(1-cos^2A)
= cos^2A/sin^A
= (cosA/sinA)^2
= (cotA)^2
= (15/8)^2
= 225/64
= {2(1+sinA)(1-sinA)}/{2(1+cosA)(1-cosA)}
= (1-sin^2A)/(1-cos^2A)
= cos^2A/sin^A
= (cosA/sinA)^2
= (cotA)^2
= (15/8)^2
= 225/64
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