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

  • 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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$x = 1$ पर $y = (1 - x)(2 - x)...(n - x)$ का अवकलज क्या है?

Difficult
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जब $x=\sqrt{2}$ है, तो $\frac{d}{d x}\left[\log \left(\sin \sqrt{\frac{x^2+1}{x^2+2}}\right)\right]$ का मान ज्ञात कीजिए।

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