જો $y = \sin^{98}(x) \cdot \cos^{39}(x)$ હોય,તો $\frac{dy}{dx}$ શોધો.

  • A
    $\left(98 \cos^{99} x \cdot \sin^{38} x\right) + \left(39 \sin^{40} x \cdot \cos^{97} x\right)$
  • B
    $\left(99 \cos^{98} x \cdot \sin^{39} x\right) - \left(40 \sin^{39} x \cdot \cos^{98} x\right)$
  • C
    $\left(98 \cos^{99} x \cdot \sin^{38} x\right) - \left(39 \sin^{40} x \cdot \cos^{97} x\right)$
  • D
    $\left(99 \cos^{98} x \cdot \sin^{39} x\right) + \left(39 \sin^{40} x \cdot \cos^{97} x\right)$

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