જો $15 \sin^{4} \alpha + 10 \cos^{4} \alpha = 6$ કોઈ $\alpha \in R$ માટે હોય,તો $27 \sec^{6} \alpha + 8 \operatorname{cosec}^{6} \alpha$ ની કિંમત ....... થશે.

  • A
    $350$
  • B
    $500$
  • C
    $400$
  • D
    $250$

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જો $\tan^2 \alpha \tan^2 \beta + \tan^2 \beta \tan^2 \gamma + \tan^2 \gamma \tan^2 \alpha + 2\tan^2 \alpha \tan^2 \beta \tan^2 \gamma = 1$ હોય,તો $\sin^2 \alpha + \sin^2 \beta + \sin^2 \gamma$ નું મૂલ્ય શોધો.

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જો $\cos A+\cos (A+B)+\cos (A+2 B)+\ldots$ $n$ પદો સુધી $=$ $\cos \left(\frac{2 A+(n-1) B}{2}\right) \sin \frac{n B}{2} \operatorname{cosec} \frac{B}{2}$ હોય,તો $\cos \frac{\pi}{19}+\cos \frac{3 \pi}{19}+\cos \frac{5 \pi}{19}+\ldots+\cos \frac{17 \pi}{19} = $

$\cos^2 76^{\circ} + \cos^2 16^{\circ} - \cos 76^{\circ} \cos 16^{\circ}$ ની કિંમત શોધો.

જો $A+B+C+D=2 \pi$ હોય,તો $\sin A+\sin B+\sin C+\sin D=$

જો $\sin A + \sin B = \frac{1}{2}$ અને $\cos A + \cos B = 1$ હોય,તો $\sin \left(\frac{A-B}{2}\right)$ ની કિંમત શોધો.

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