$\cos 15^{\circ} - \sin 15^{\circ}$ નું મૂલ્ય શું છે?

  • A
    $0$
  • B
    $\frac{1}{\sqrt{2}}$
  • C
    $-\frac{1}{\sqrt{2}}$
  • D
    $\frac{1}{2\sqrt{2}}$

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

$\frac{3 + \cot 76^{\circ} \cot 16^{\circ}}{\cot 76^{\circ} + \cot 16^{\circ}}$ ની કિંમત શોધો.

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ધારો કે $\alpha, \beta$ એવા છે કે જેથી $\pi < (\alpha - \beta) < 3\pi$. જો $\sin \alpha + \sin \beta = -\frac{21}{65}$ અને $\cos \alpha + \cos \beta = -\frac{27}{65}$ હોય,તો $\cos \frac{\alpha - \beta}{2}$ નું મૂલ્ય શોધો.

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