જો $\cos \theta = \frac{1}{2}\left( a + \frac{1}{a} \right)$ હોય,તો $\cos 3\theta$ નું મૂલ્ય કેટલું થાય?

  • A
    $\frac{1}{8}\left( a^3 + \frac{1}{a^3} \right)$
  • B
    $\frac{3}{2}\left( a + \frac{1}{a} \right)$
  • C
    $\frac{1}{2}\left( a^3 + \frac{1}{a^3} \right)$
  • D
    $\frac{1}{3}\left( a^3 + \frac{1}{a^3} \right)$

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$\tan 1^{\circ} \tan 2^{\circ} \ldots \tan 89^{\circ}$ નું મૂલ્ય શું છે?

જો $x = r \cos \theta \cos \phi$,$y = r \cos \theta \sin \phi$ અને $z = r \sin \theta$ હોય,તો $x^{2} + y^{2} + z^{2}$ ની કિંમત શોધો.

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પદાવલિ $\frac{\tan 57^{\circ}+\cot 37^{\circ}}{\tan 33^{\circ}+\cot 53^{\circ}}$ ની કિંમત કેટલી થાય?

જો $A+B=45^{\circ}$ અને $(\cot A-1)(\cot B-1)=4 K$ હોય,તો $K=$

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