$\sin 47^\circ + \sin 61^\circ - \sin 11^\circ - \sin 25^\circ$ ની કિંમત શોધો.

  • A
    $\sin 36^\circ $
  • B
    $\cos 36^\circ $
  • C
    $\sin 7^\circ $
  • D
    $\cos 7^\circ $

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જો બે ખૂણાઓ $\alpha, \beta$ એવા હોય કે $0 < \alpha, \beta < \frac{\pi}{4}$,$\sqrt{1+\cos 2 \alpha}=\frac{3}{\sqrt{5}}$ અને $\frac{\sqrt{1-\cos 2 \beta}}{\sqrt{1+\cos 2 \beta}}=\frac{1}{7}$,તો $(2 \alpha+\beta)=$

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$\cos 105^\circ + \sin 105^\circ$ નું મૂલ્ય શું છે?

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