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SSC CHSL 2023 PYQ — Question 56

SSC CHSL - 09 March 2023 - Shift 1 • Quantitative Aptitude • Q56

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If cot y=125y = \frac{12}{5}, then what is the value of cos2y?

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Correct answer: C

Explanation

The correct answer is Option 3 i.e.144169 \frac{144}{169}.

cot y = 12/5

⇒ cot2y = (12/5)2 = 144/25

⇒ cosec2y = 144/25 + 1 = 169/25

⇒ sin2y = 25/169

⇒ cos2y = 1 - 25/169 = 144/169