If $\tan \theta = \frac{{20}}{{21}},$ 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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