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Express the trigonometric ratios $sin\ A, sec\ A$ and $tan\ A$ in terms of $cot\ A$.
To do:
We have to express the trigonometric ratios $sin\ A, sec\ A$ and $tan\ A$ in terms of $cot\ A$.
Solution:
We know that,
$\operatorname{cosec^2}\ A - cot^2\ A = 1$
Therefore,
$\operatorname{cosec}^{2}\ A=1+\cot ^{2}\ A$
$\operatorname{cosec}\ A=\sqrt{1+\cot ^{2}\ A}$
$\sin\ A=\frac{1}{\sqrt{1+\cot ^{2}\ A}}$
$\sec ^{2} \mathrm{~A}-\tan ^{2} \mathrm{~A}=1$
$\Rightarrow \sec ^{2} \mathrm{~A}=1+\tan ^{2} \mathrm{~A}$
$=1+\frac{1}{\cot ^{2} \mathrm{~A}}$
$=\frac{\cot ^{2}+1}{\cot ^{2} \mathrm{~A}}$
$\Rightarrow \sec \mathrm{A}=\frac{\sqrt{\cot ^{2} \mathrm{~A}+1}}{\cot \mathrm{A}}$
$\tan \mathrm{A}=\frac{1}{\cot \mathrm{A}}$
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