જો $\theta$ ત્રીજા ચરણમાં હોય અને $\cos \theta = -\frac{3}{5}$ હોય,તો $\tan \theta$ ની કિંમત શોધો.

  • A
    $\frac{2}{3}$
  • B
    $-\frac{2}{3}$
  • C
    $-\frac{4}{3}$
  • D
    $\frac{4}{3}$

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$\cos 1^\circ + \cos 2^\circ + \cos 3^\circ + \dots + \cos 180^\circ = $

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