other govt exam CSIR Junior Secretariat Assistant (JSA) 2025 Mock Test 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
\(\frac{1}{\sqrt {1+k^2}}\)