Zol Tun Kul
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 Apr 4 awarded Popular Question Apr 1 awarded Nice Question Jan 13 awarded Yearling Dec 14 asked What is the exact role of the integrals in a PID Controller? Dec 8 accepted Solving $\int \left ( \frac{5x^2+3x-2}{x^3+2x^2} \right )$ via partial fractions Dec 8 asked Solving $\int \left ( \frac{5x^2+3x-2}{x^3+2x^2} \right )$ via partial fractions Dec 6 accepted Solving $\int \frac{1}{2x^2+3x+2}dx$ with partial fractions Dec 6 revised Solving $\int \frac{1}{2x^2+3x+2}dx$ with partial fractions edited body Dec 6 asked Solving $\int \frac{1}{2x^2+3x+2}dx$ with partial fractions Dec 5 awarded Popular Question Nov 15 asked How can I calculate the coordinates of the two extremes of a line when it is rotated? Nov 14 awarded Popular Question Nov 10 asked Help understanding oblique asymptotes for $f(x) = 2x^3+3x^2-12x$ Nov 10 accepted Using L'Hopital to solve $\lim_{x\to +\infty}\frac{\frac{-1}{x^2}}{\sin^2\left(\frac{2}{x}\right)}$ Nov 10 comment Using L'Hopital to solve $\lim_{x\to +\infty}\frac{\frac{-1}{x^2}}{\sin^2\left(\frac{2}{x}\right)}$ Why did you pick $\frac{2}{x}$ in particular? I mean, I can see why your solution works, but I'm having a hard time understanding your reasoning behind picking $\frac{2}{x}$ and not something else. Is it because of the sine function? Nov 10 comment Using L'Hopital to solve $\lim_{x\to +\infty}\frac{\frac{-1}{x^2}}{\sin^2\left(\frac{2}{x}\right)}$ I can see and understand why this works. However, it's not clear to me what triggered your idea of dividing $\frac{-1}{x^2}$ by $\frac{-1}{4}$. What made you see that? Nov 10 asked Using L'Hopital to solve $\lim_{x\to +\infty}\frac{\frac{-1}{x^2}}{\sin^2\left(\frac{2}{x}\right)}$ Nov 9 accepted Solving $\lim_{x\to-\infty}x^2\cdot e^x$ with L'Hopital Nov 9 comment Solving $\lim_{x\to-\infty}x^2\cdot e^x$ with L'Hopital Do we have to change $x\to -\infty$ to $x \to \infty$? Can't we just keep $e^{-x}$? Because when you evaluate, it will become $e^{--\infty}$ anyway. Nov 9 asked Solving $\lim_{x\to-\infty}x^2\cdot e^x$ with L'Hopital