$\lim\limits_{x \rightarrow \infty} \frac{\int\limits_0^{2 x} t e^{t^2} d t}{e^{4 x^2}}$ equals
Answer & explanation
Correct answer: option 3
We have,
$I=\lim\limits_{x \rightarrow \infty} \frac{\int\limits_0^{2 x} t e^{t^2} d t}{e^{4 x^2}}$ ($\frac{∞}{∞}$ form)
$\Rightarrow I=\lim\limits_{x \rightarrow \infty} \frac{2 \times 2 x e^{4 x^2}}{e^{4 x^2} \times 8 x}$ [Using L' Hospital rule]
$\Rightarrow I=\lim\limits_{x \rightarrow \infty} \frac{1}{2}=\frac{1}{2}$