ત્રિકોણ $ABC$ માં,$CD$ એ ખૂણા $C$ નો દ્વિભાજક છે. જો $\cos \frac{C}{2} = \frac{1}{3}$ અને $CD = 6$ હોય,તો $\left( \frac{1}{a} + \frac{1}{b} \right)$ ની કિંમત કેટલી થાય?

  • A
    $\frac{1}{9}$
  • B
    $\frac{1}{12}$
  • C
    $\frac{1}{6}$
  • D
    આમાંથી કોઈ નહીં

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$0 < x \leq \pi$ માટે, $\sinh ^{-1}(\cot x)$ ની કિંમત શું થાય?

જો $\cos x + \cos y - \cos (x + y) = \frac{3}{2}$ હોય,તો

$\cos ^2 5^{\circ}-\cos ^2 15^{\circ}-\sin ^2 15^{\circ}+\sin ^2 35^{\circ}+\cos 15^{\circ} \sin 15^{\circ}-\cos 5^{\circ} \sin 35^{\circ} = $

જો $0 < \theta < \frac{\pi}{4}$ અને $8 \cos \theta + 15 \sin \theta = 15$ હોય,તો $15 \cos \theta - 8 \sin \theta = $

$\frac{\sqrt{2}-\sin \alpha-\cos \alpha}{\sin \alpha-\cos \alpha}=$

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