જો $\sin (\theta + \alpha ) = a$ અને $\sin (\theta + \beta ) = b$ હોય,તો $\cos 2(\alpha - \beta ) - 4ab\cos (\alpha - \beta )$ ની કિંમત શોધો.

  • A
    $1 - a^2 - b^2$
  • B
    $1 - 2a^2 - 2b^2$
  • C
    $2 + a^2 + b^2$
  • D
    $2 - a^2 - b^2$

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Similar Questions

જો $\sec(\theta+\alpha)$,$\sec\theta$,અને $\sec(\theta-\alpha)$ સમાંતર શ્રેણીમાં હોય,તો $\cos\theta \cdot \sec\frac{\alpha}{2}$ ની કિંમત શોધો.

જો $\frac{\cos x}{\cos (x-2 y)}=\lambda$ હોય,તો $\tan (x-y) \tan y$ ની કિંમત શું થાય?

જો $\theta \in \left[-\frac{\pi}{2}, \frac{\pi}{2}\right]$ માટે $2 \cos \theta + \sin \theta = 1$ અને $7 \cos \theta + 6 \sin \theta = k$ હોય,તો $k$ ની શક્ય કિંમતો કઈ છે?

જો $3 \sin (\alpha-\beta)=5 \cos (\alpha+\beta)$ અને $\alpha+\beta \neq \frac{\pi}{2}$ હોય,તો $\frac{\tan \left(\frac{\pi}{4}-\alpha\right)}{\tan \left(\frac{\pi}{4}-\beta\right)}=$

$\frac{\sin 1^{\circ}+\sin 2^{\circ}+\ldots+\sin 89^{\circ}}{2(\cos 1^{\circ}+\cos 2^{\circ}+\ldots+\cos 44^{\circ})+1} = $

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