કોઈપણ વાસ્તવિક કિંમત $\theta$ માટે $3 \cos \theta + 5 \sin \left( \theta - \frac{\pi}{6} \right)$ ની મહત્તમ કિંમત કેટલી છે?

  • A
    $\sqrt{19}$
  • B
    $\frac{\sqrt{79}}{2}$
  • C
    $\sqrt{34}$
  • D
    $\sqrt{31}$

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જો $\operatorname{cosec}^{2} \theta = \frac{4xy}{(x+y)^{2}}$ હોય,તો

$(\cos \alpha + \cos \beta )^2 + (\sin \alpha + \sin \beta )^2 = $

$\frac{\cot 54^\circ}{\tan 36^\circ} + \frac{\tan 20^\circ}{\cot 70^\circ}$ ની કિંમત શોધો.

જો $\sin 21^{\circ} = \frac{x}{y}$ હોય,તો $\sec 21^{\circ} - \sin 69^{\circ}$ ની કિંમત શોધો.

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જો $\tan \theta \cdot \cos 60^{\circ} = \frac{\sqrt{3}}{2}$ હોય,તો $\sin (\theta - 15^{\circ})$ ની કિંમત શોધો.

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