જો $x=\log _e\left(\frac{\cos \frac{y}{2}-\sin \frac{y}{2}}{\cos \frac{y}{2}+\sin \frac{y}{2}}\right)$ અને $\tan \frac{y}{2}=\sqrt{\frac{1-t}{1+t}}$ હોય,તો $\left(\frac{dy}{dx}\right)_{t=\frac{1}{2}}$ નું મૂલ્ય શોધો.

  • A
    $\frac{1}{2}$
  • B
    $-\frac{1}{2}$
  • C
    $\frac{1}{4}$
  • D
    $-\frac{1}{4}$

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જો $x = a(1 - \cos \theta)$ અને $y = a(\theta + \sin \theta)$ હોય,તો $\frac{dy}{dx} = $ . . . . . . .

જો $x = a \sin^3 t$ અને $y = a \cos^3 t$ હોય, તો $t = \frac{\pi}{3}$ આગળ $\frac{d^2y}{dx^2}$ નું મૂલ્ય કેટલું થાય?

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