$\left(-59\right)-\left(-49\right)$
$5\frac{dy}{dx}-15xy=3x$
$\lim_{x\to-\infty}\left(\frac{\sqrt{4x^2+1}}{2x-3}\right)$
$\arccos\left(\frac{1240}{1344}\right)$
$2\left(x^2-5x+3\right)^2$
$\int5\cot^4\left(\frac{x}{5}\right)dx$
$x\cdot y'-y=x^2$
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