$\frac{\sqrt{2}-\sin \alpha-\cos \alpha}{\sin \alpha-\cos \alpha}=$

  • A
    $\sec \left(\frac{\alpha}{2}-\frac{\pi}{8}\right)$
  • B
    $\cos \left(\frac{\pi}{8}-\frac{\alpha}{2}\right)$
  • C
    $\tan \left(\frac{\alpha}{2}-\frac{\pi}{8}\right)$
  • D
    $\cot \left(\frac{\alpha}{2}-\frac{\pi}{2}\right)$

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$\frac{4 \sin 9^{\circ} \sin 21^{\circ} \sin 39^{\circ} \sin 51^{\circ} \sin 69^{\circ} \sin 81^{\circ}}{\sin 54^{\circ}}$ ની કિંમત શોધો.

શ્રેણી $\sum_{n=1}^{\infty} \sin \left(\frac{n! \pi}{720}\right)$ નો સરવાળો શું થાય?

જો $\tan x = \frac{2b}{a - c}$ $(a \ne c)$,$y = a \cos^2 x + 2b \sin x \cos x + c \sin^2 x$ અને $z = a \sin^2 x - 2b \sin x \cos x + c \cos^2 x$ હોય,તો:

Difficult
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$\theta$ નું સૌથી નાનું ધન મૂલ્ય (અંશમાં) જેના માટે $\tan(\theta+100^{\circ})=\tan(\theta+50^{\circ}) \tan(\theta) \tan(\theta-50^{\circ})$ માન્ય છે,તે છે ($^{\circ}$ માં)

$\operatorname{cosec} 48^{\circ}+\operatorname{cosec} 96^{\circ}+\operatorname{cosec} 192^{\circ}+\operatorname{cosec} 384^{\circ}=$

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