જો $y = \sin x \sin 3x$ હોય,તો $n^{th}$ વિકલન $y_n$ શોધો.

  • A
    $\frac{1}{2} \left[ \cos \left( 2x + \frac{n\pi}{2} \right) - \cos \left( 4x + \frac{n\pi}{2} \right) \right]$
  • B
    $\frac{1}{2} \left[ 2^n \cos \left( 2x + \frac{n\pi}{2} \right) - 4^n \cos \left( 4x + \frac{n\pi}{2} \right) \right]$
  • C
    $\frac{1}{2} \left[ 4^n \cos \left( 4x + \frac{n\pi}{2} \right) - 2^n \cos \left( 2x + \frac{n\pi}{2} \right) \right]$
  • D
    આમાંથી કોઈ નહીં

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