Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

If cot A = k, then sin A is equal to:

(presume that A is an acute angle)

1
\(\frac{k^2}{\sqrt {1+k^2}}\)
2
\(\frac{1}{k}\)
3
\(-\frac{1}{k}\)
4
\(\frac{1}{\sqrt {1+k^2}}\)

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