$\frac{d}{dt}(\tan t + t^2 \operatorname{cosech} t)$ का मान क्या होगा?

  • A
    $\sec^2 t + 2t \operatorname{cosech} t - t^2 \operatorname{cosech} t \operatorname{coth} t$
  • B
    $\sec^2 t + 2t \operatorname{cosech} t - t^2 \operatorname{cosech} t \operatorname{coth} t$
  • C
    $\sec t + 2t \operatorname{coth} t - t^2 \operatorname{cosech} t \operatorname{coth} t$
  • D
    $\sec^2 t + 2t \operatorname{cosech} t + t^2 \operatorname{cosech} t \operatorname{coth} t$

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