Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesFundamental trigonometrical ratios and functions, Trigonometrical ratio of allied angles
EasyIf $\tan \theta = \frac{20}{21}$,then $\cos \theta$ will be
- A$\pm \frac{20}{41}$
- B$\pm \frac{1}{21}$
- C$\pm \frac{21}{29}$
- D$\pm \frac{20}{21}$
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