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

Asked by  | 15th Feb, 2012, 07:12: PM

Expert Answer:

(secA+cosA)(secA-cosA) = sec2A - cos2A = 1 + tan2A - (1 - sin2A) = tan2A + sin2A

Answered by  | 15th Feb, 2012, 07:18: PM

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