(secA - tanA) ^2 = 1 - sinA/1+sinA
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Answer:
R.H.S. = (1 - sinA) / (1 + sinA)
Divide by cosA
= (secA - tanA) / (sec A + tan A)
By rationalizing
= (secA - tanA)²
= L.H.S.
Hence, proved.
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