Question
Wed February 15, 2012 By:
 

(SecA+CosA)(SecA-CosA)=TanA.TanA+SinA.SinA

Expert Reply
Wed February 15, 2012
(secA+cosA)(secA-cosA) = sec2A - cos2A = 1 + tan2A - (1 - sin2A) = tan2A + sin2A
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