यदि y = u2 + log u और u = ex है, तो \(\rm \frac{dy}{dx}\) का मान ज्ञात कीजिए। 

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  1. 1 + e2x
  2. 1 + e-2x
  3. 1 + 2e2x
  4. 1 + 2e-2x

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Option 3 : 1 + 2e2x
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दिया गया है:

y = u2 + log u और u = ex

अवधारणा:

शृंखला नियम की अवधारणा का प्रयोग करते हैं,

\(\rm \frac{dy}{dx}=\frac{dy}{du}\cdot\frac{du}{dx}\)

और \(\rm \frac{d}{dx}e^x=e^x\)

गणना:

\(\rm u=e^x\)

अब, \(\rm x\) के सापेक्ष अवकलन करने पर,

\(\rm \frac{du}{dx}=e^x\)

\(\rm y=u^2+log\ u\)

अब, \(\rm x\) के सापेक्ष अवकलन करने पर,

\(\rm \frac{dy}{dx}=2u \frac{du}{dx}+\frac{1}{u} \frac{du}{dx}\)

अब, \(\rm u \) और \(\frac{du}{dx}\) का मान रखने पर,

\(\rm \frac{dy}{dx}=2e^x\cdot \ e^x+\frac{1}{e^x} \ e^x\)

\(\rm \implies \frac{dy}{dx}=2e^{2x}+1\)

अतः विकल्प (3) सही है।

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