यदि $\sin x = -\frac{3}{5}$,जहाँ $\pi < x < \frac{3\pi}{2}$ है,तो $80(\tan^2 x - \cos x)$ का मान ज्ञात कीजिए:

  • A
    $109$
  • B
    $108$
  • C
    $18$
  • D
    $19$

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$\frac{1+\tanh x}{1-\tanh x}$ का मान क्या है?

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