यदि $\tan (\pi \cos \theta ) = \cot (\pi \sin \theta )$ है,तो $\cos \left( \theta - \frac{\pi }{4} \right)$ का मान ज्ञात कीजिए।

  • A
    $\frac{1}{2\sqrt{2}}$
  • B
    $\frac{1}{\sqrt{2}}$
  • C
    $\frac{1}{3\sqrt{2}}$
  • D
    $\frac{1}{4\sqrt{2}}$

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फलन $f(x) = \cos x \cos(x + 2) - \cos^2(x + 1)$ का ग्राफ क्या है?

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$\tan 6^{\circ} \tan 42^{\circ} \tan 66^{\circ} \tan 78^{\circ} = $

यदि $\cos \alpha = \frac{2 \cos \beta - 1}{2 - \cos \beta}$ है,तो $\tan \frac{\alpha}{2} \cot \frac{\beta}{2}$ का मान ज्ञात कीजिए,जहाँ $(0 < \alpha < \pi$ और $0 < \beta < \pi)$.

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