જો $\tan \theta = \frac{20}{21}$ હોય,તો $\cos \theta$ શું થશે?

  • A
    $\pm \frac{20}{41}$
  • B
    $\pm \frac{1}{21}$
  • C
    $\pm \frac{21}{29}$
  • D
    $\pm \frac{20}{21}$

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