$\lim_{x\to0}2+\frac{5}{x^2}$
$y'=\frac{x+9x^4}{2yx^2}$
$49x^2+14xy+y^2$
$\left(-4\right)\left(-2\right)-6\left(2-5\right)$
$\frac{2}{xsinx}$
$\frac{dy}{dx}=\frac{y+x\cos x}{x}$
$\int-\frac{8\left(x\right)}{\sqrt{25-x^2}}dx$
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