Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesTrigonometrical ratios of multiple and sub-multiple angles
EasyIf $\tan \theta = \frac{1}{3}$,then $\cos 2 \theta = $
- A$\frac{1}{4}$
- B$\frac{1}{10}$
- C$\frac{1}{5}$
- D$\frac{4}{5}$
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