Cot=7/8,evaluate:. (1+sin)(1-sin)/(1+cos)(1-cos)

1.	Cot=7/8,evaluate:. (1+sin)(1-sin)/(1+cos)(1-cos)
Answer» cot=7/8(1+sin)(1-sin)/(1+cos)(1-cos)=1^2-sin^2/1^2-cos^2=cos^2/sin^2 [sin^2+cos^2=1]=cot^2=(7/8)^249/64

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