If \sin ⁡C = \frac{9}{10}, then what is the value of cos 2 C?

SSC CHSL 16 mar 2023 Shift 1 Paper

Section: Quantitative Aptitude

Question : 72 of 100

Marks: +1, -0

sin \;⁡C = \;{9}/{10}

, then what is the value of cos² C?

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