$\frac{1}{{\sin 10^\circ }} - \frac{{\sqrt 3 }}{{\cos 10^\circ }} = $

  • A
    $0$
  • B
    $1$
  • C
    $2$
  • D
    $4$

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કોઈપણ ત્રિકોણ $ABC$ માં,પદાવલિ ${\sin ^2}\frac{A}{2} + {\sin ^2}\frac{B}{2} + {\sin ^2}\frac{C}{2}$ કોના બરાબર છે?

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