$\frac{d}{dx}[e^{ax} \cos(bx + c)] = ?$

  • A
    $e^{ax}[a \cos(bx + c) - b \sin(bx + c)]$
  • B
    $e^{ax}[a \sin(bx + c) - b \cos(bx + c)]$
  • C
    $e^{ax}[\cos(bx + c) - \sin(bx + c)]$
  • D
    इनमें से कोई नहीं

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फलन $\frac{x^{2} \cos \left(\frac{\pi}{4}\right)}{\sin x}$ का अवकलज ज्ञात कीजिए।

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