જો $y = \sin^2 \alpha + \cos^2(\alpha + \beta) + 2 \sin \alpha \sin \beta \cos(\alpha + \beta)$ હોય,તો $\frac{d^3y}{d\alpha^3}$ શોધો (જ્યાં $\beta$ અચળ છે).

  • A
    $\frac{\sin^3(\alpha + \beta)}{\cos \alpha}$
  • B
    $\cos(\alpha + 3\beta)$
  • C
    $0$
  • D
    આમાંથી કોઈ નહીં

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