यदि $u=\sin \left(\frac{x}{y}\right)$,$x=e^t$,और $y=t^2$ है,तो $t^6\left(\frac{d u}{d t}\right)^2 \div \left(e^{2 t}(t-2)^2\right)=$

  • A
    $2 u$
  • B
    $u^2$
  • C
    $1-u^2$
  • D
    $\cos u$

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यदि $x = a \sec^{2} \theta$ और $y = a \tan^{2} \theta$ है,तो $\frac{d^{2} y}{d x^{2}}$ ज्ञात कीजिए।

यदि $x = \sin t \cos 2t$ और $y = \cos t \sin 2t$ है,तो $t = \frac{\pi}{4}$ पर $\frac{dy}{dx}$ का मान क्या होगा?

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