यदि $\frac{5 \sinh 2x}{7+6 \cosh 2x} = \frac{3}{2}$ है,तो $3 \tanh^2 x + 20 \tanh x = $

  • A
    $13$
  • B
    $26$
  • C
    $39$
  • D
    $\frac{13}{2}$

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यदि $\sin x + \sin y = \alpha$ और $\cos x + \cos y = \beta$ है,तो $\operatorname{cosec}(x + y) = $

योगफल $S = \sin \theta + \sin 2\theta + \dots + \sin n\theta$ किसके बराबर है?

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