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rationalise ur denominator by multiplying root of (1-sina), so you GET a perfect SQUARE in numerator nd root of (1-sin^2a) which is cosa. so FINALLY you get,

\frac{1-sina}{cos a}

give the numerator individual denominator, so u get,

\frac{1}{cos a} - \frac{sin a}{cos a} =sec a- tan a

HOPE this HELPS!


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