if cot A 15/8 , evaluate (2+2 sin A) (1-sin A)/(1+cos A) (2-2 cos A).

Asked by Nikhil | 2nd Sep, 2012, 10:00: PM

Expert Answer:

(2+2 sin A) (1-sin A)/(1+cos A) (2-2 cos A)
= 2(1+sin A) (1-sin A)/2(1+cos A) (1-cos A)
= (1-sin2A)/(1-cos2A)
= cos2A/sin2A
= cot2A
= 225/64

Answered by  | 2nd Sep, 2012, 10:55: PM

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