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Prove that:$ (\sec A-\tan A)^{2}=\frac{1-\sin A}{1+\sin A} $
To do:
We have to prove that \( (\sec A-\tan A)^{2}=\frac{1-\sin A}{1+\sin A} \).
Solution:
We know that,
$\sin ^{2} A+\cos^2 A=1$.......(i)
$\sec A=\frac{1}{\cos A}$......(ii)
$\tan A=\frac{\sin A}{\cos A}$......(iii)
Therefore,
$=(\sec A-\tan A)^{2}$
$=\left(\frac{1}{\cos A}-\frac{\sin A}{\cos A}\right)^{2}$
$=\left(\frac{1-\sin A}{\cos A}\right)^{2}$
$=\frac{(1-\sin A)^{2}}{\cos ^{2} A}$
$=\frac{(1-\sin A)^{2}}{1-\sin ^{2} A}$
$=\frac{(1-\sin A)(1-\sin A)}{(1+\sin A)(1-\sin A)}$
$=\frac{1-\sin A}{1+\sin A}$
Hence proved.
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