જો $\sin ^{2} \alpha+\sin ^{2} \beta=2$ હોય,તો $\cos \left(\frac{\alpha+\beta}{2}\right)$ ની કિંમત કેટલી થાય?

  • A
    $1$
  • B
    $-1$
  • C
    $0$
  • D
    $0.5$

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$\tan 20^\circ + 2\tan 50^\circ - \tan 70^\circ$ નું મૂલ્ય કેટલું થાય?

જો $\sec \theta + \tan \theta = p, (p \neq 0)$ હોય,તો $\sec \theta$ ની કિંમત શોધો:

$\cos y \cos \left( \frac{\pi}{2} - x \right) - \cos \left( \frac{\pi}{2} - y \right) \cos x + \sin y \cos \left( \frac{\pi}{2} - x \right) + \cos x \sin \left( \frac{\pi}{2} - y \right)$ ની કિંમત શૂન્ય થાય,જો

$\left[\frac{\left(\sec ^{3} x-\tan ^{3} x\right)}{(\sec x-\tan x)}\right]-2 \tan ^{2} x-\sec x \tan x $ નું સાદું રૂપ શું છે?

$\cos \frac{\pi }{7} \cos \frac{2\pi }{7} \cos \frac{4\pi }{7} = $

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