જો $A + C = B$ હોય,તો $\tan A \tan B \tan C = $

  • A
    $\tan A \tan B + \tan C$
  • B
    $\tan B - \tan C - \tan A$
  • C
    $\tan A + \tan C - \tan B$
  • D
    $ - (\tan A \tan B + \tan C)$

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જો $\alpha$ એ $3^{\text{rd}}$ ચરણમાં હોય,$\beta$ એ $2^{\text{nd}}$ ચરણમાં હોય અને $\tan \alpha = \frac{1}{7}$ તથા $\sin \beta = \frac{1}{\sqrt{10}}$ હોય,તો $\sin(2\alpha + \beta)$ ની કિંમત શોધો.

$\cos A + \cos (240^\circ + A) + \cos (240^\circ - A) = $

$\frac{3 + \cot 76^{\circ} \cot 16^{\circ}}{\cot 76^{\circ} + \cot 16^{\circ}}$ ની કિંમત શોધો.

$1+\cos 10^{\circ}+\cos 20^{\circ}+\cos 30^{\circ}=$

જો $\cos (A + B) = \alpha \cos A \cos B + \beta \sin A \sin B$ હોય,તો $(\alpha, \beta) =$

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