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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$\frac{\sqrt{2} \cos 45^{\circ}+\cos 56^{\circ}+\cos 58^{\circ}-\cos 66^{\circ}}{\sqrt{2} \cos 28^{\circ} \cos 29^{\circ} \sin 33^{\circ}} = ?$

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