જો $\alpha, \beta$ લઘુકોણ હોય કે જેથી $\sin \beta=2 \sin \alpha$ અને $3 \cos \beta=2 \cos \alpha$ થાય,તો $\sec (\alpha+\beta)=$

  • A
    $4$
  • B
    $\sqrt{15}$
  • C
    $\sqrt{20}$
  • D
    $5$

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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 $\tan \theta_1 = k \cot \theta_2$ હોય,તો $\frac{\cos (\theta_1 + \theta_2)}{\cos (\theta_1 - \theta_2)} = $

જો $\tan \left(\frac{\pi}{4}+\frac{\alpha}{2}\right)=\tan ^3\left(\frac{\pi}{4}+\frac{\beta}{2}\right)$ હોય,તો $\frac{3+\sin ^2 \beta}{1+3 \sin ^2 \beta}=$

$\cos 12^{\circ} + \cos 60^{\circ} + \cos 84^{\circ} + \cos 132^{\circ} + \cos 156^{\circ} = $

જો $\tan \theta + \sin \theta = a$ અને $\tan \theta - \sin \theta = b$ હોય,તો $\cot \theta$ અને $\operatorname{cosec} \theta$ ની કિંમતો અનુક્રમે શું થાય?

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