Prove that sec A (1 – sin A)(sec A + tan A) = 1.
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Step-by-step explanation:
seca(1-sina)(1/cosa+Sina/cosa)
=> seca(1-sina)(1-sina)/cosa
=> seca(1-sin²a)/cosa
=> seca cos ²a/cosa
=> 1/cos a×cosa
=1
hope this may help u..........
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