સંખ્યા $\sum_{k=0}^{44} \frac{1}{\cos k^{\circ} \cos (k+1)^{\circ}}$ નો પૂર્ણાંક ભાગ શોધો.

  • A
    $50$
  • B
    $52$
  • C
    $57$
  • D
    $59$

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જો $\cos \theta - \sin \theta = \sqrt{2} \sin \theta$ હોય, તો $\cos \theta + \sin \theta$ ની કિંમત શોધો.

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$\sum_{k=1}^3 \cos^2 \left((2k-1) \frac{\pi}{12}\right)$ ની કિંમત શોધો.

જો $x$ અને $y$ લઘુકોણ હોય કે જેથી $\cos x + \cos y = \frac{3}{2}$ અને $\sin x + \sin y = \frac{3}{4}$ થાય,તો $\sin(x + y)$ ની કિંમત શોધો.

કિંમત શોધો: $\cos^2 \left( \frac{\pi}{4} - \beta \right) - \sin^2 \left( \alpha - \frac{\pi}{4} \right)$

કિંમત શોધો: $\cos \frac{\pi}{7} \cos \frac{2 \pi}{7} \cos \frac{3 \pi}{7} \cos \frac{\pi}{14} \cos \frac{3 \pi}{14} \cos \frac{5 \pi}{14}$

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