यदि $\int x^3 \sin 3x \, dx = \frac{1}{27}[f(x) \cos 3x + g(x) \sin 3x] + c$ है, तो $f(1) + g(1) =$

  • A
    $14$
  • B
    $6$
  • C
    $4$
  • D
    $12$

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यदि $I = \int e^x \sin 2x \, dx$ है,तो $K$ के किस मान के लिए $KI = e^x(\sin 2x - 2\cos 2x) + C$ होगा?

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