Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

ఒకవేళ \(\rm \sin C=\frac{9}{10}\) , cos2 C విలువ ఎంత?

1
\(\frac{19}{100}\)
2
\(\frac{81}{\sqrt{19}}\)
3
\(\frac{19}{10}\)
4
\(\frac{\sqrt{19}}{100}\)

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