જો $x = a(\cos \theta + \theta \sin \theta)$, $y = f(\theta)$, $f(2\pi) = 0$, $\frac{dy}{dx} = \frac{\tan \theta}{\theta}$, $\theta \neq 0$ અને $\theta \neq (2n+1)\frac{\pi}{2}$ હોય, તો $f\left(\frac{\pi}{3}\right) = $

  • A
    $2a\pi$
  • B
    $\frac{\pi}{2}a$
  • C
    $\frac{a}{2}$
  • D
    $-2a$

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