Please prove the Trigonometric identity

Asked by  | 19th Jun, 2009, 10:45: PM

Expert Answer:

L.H.S=sec A ( 1 - sin A ) ( secA + tan A ) =1/cosA (1-sinA)(1/cosA +sinA/cosA)=(1-sinA)(1+sinA)/cos2A=(1-sin2A)/cos2A=cos2A/cos2A=1=R.H.S

Hence given identity has been proved.

Answered by  | 20th Jun, 2009, 05:20: PM

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