$\frac{e^{4x} + e^{-4x} + 14}{4(e^x - e^{-x})^2} = \dots$

  • A
    $\sinh^2 x + \coth^2 x$
  • B
    $\sinh^2 x + \text{sech}^2 x$
  • C
    $\cosh^2 x + \text{sech}^2 x$
  • D
    $\cosh^2 x + \tanh^2 x$

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यदि $A(n) = \sin^n \alpha + \cos^n \alpha$ है,तो $A(1) A(4) + A(2) A(5) =$

यदि $P = \sin \frac{2 \pi}{7} + \sin \frac{4 \pi}{7} + \sin \frac{8 \pi}{7}$ और $Q = \cos \frac{2 \pi}{7} + \cos \frac{4 \pi}{7} + \cos \frac{8 \pi}{7}$ है,तो बिंदु $(P, Q)$ किस त्रिज्या वाले वृत्त पर स्थित है?

यदि $0 < \theta < \frac{\pi}{4}$ और $8 \cos \theta + 15 \sin \theta = 15$ है,तो $15 \cos \theta - 8 \sin \theta = $

$\cos 6^{\circ} \sin 24^{\circ} \cos 72^{\circ} = $

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