જો $\theta$ અને $\phi$ એ $1^{st}$ ચરણમાં આવેલા ખૂણાઓ હોય કે જેથી $\tan \theta = 1/7$ અને $\sin \phi = 1/\sqrt{10}$ હોય,તો:

  • A
    $\theta + 2\phi = 90^\circ$
  • B
    $\theta + 2\phi = 60^\circ$
  • C
    $\theta + 2\phi = 30^\circ$
  • D
    $\theta + 2\phi = 45^\circ$

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$\cos ^2 48^{\circ}-\sin ^2 12^{\circ} = $ . . . . . . ,જો $\sin 18^{\circ} = \frac{\sqrt{5}-1}{4}$ હોય તો.

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