$\lim_{x\to1}\left(\frac{1-x}{x^2}\right)$
$\left(5x^3-9y^4\right)\left(5x^3+9y^4\right)$
$x^4y^2-x^2y^4=0$
$\int\frac{1-\sqrt{3x+2}}{1+\sqrt{3x+2}}dx$
$\frac{x}{3}+7=11$
$6^2+2.5^2$
$-758-\left(-132\right)$
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