यदि $\int (\sin 2x - \cos 2x) \,dx = \frac{1}{\sqrt{2}} \sin(2x - a) + b$ है,तो

  • A
    $a = \frac{\pi}{4}, b = 0$
  • B
    $a = -\frac{\pi}{4}, b = 0$
  • C
    $a = \frac{5\pi}{4}, b = \text{कोई भी स्थिरांक}$
  • D
    $a = -\frac{5\pi}{4}, b = \text{कोई भी स्थिरांक}$

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फलन $\sin 3x \cos 4x$ का समाकलन ज्ञात कीजिए।

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