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Prove the following trigonometric identities:$ \left(1-\cos ^{2} A\right) \operatorname{cosec}^{2} A=1 $
To do:
We have to prove that \( \left(1-\cos ^{2} A\right) \operatorname{cosec}^{2} A=1 \).
Solution:
We know that,
$ \sin ^{2} A+\cos ^{2} A=1$.......(i)
$\sin ^{2} A\times\operatorname{cosec}^{2} A=1$.......(ii)
Therefore,
$\left(1-\cos ^{2} A\right) \operatorname{cosec}^{2} A=(\sin ^{2} A)(\operatorname{cosec}^{2} A)$ (From (i))
$=\sin ^{2} A\times\operatorname{cosec}^{2} A$ (From (ii))
$=1$
Hence proved.
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