$\int\frac{\left(2x+3-x^2\right)}{\sqrt{x}}dx$
$x^4-x^2-1=-x^4+x^2-1$
$6\left(13\right)-15$
$7-\left|5-8\right|-\left(4-12+6-11\right)$
$\lim_{x\to\infty}\left(\frac{e^x}{7^e}\right)$
$\int\frac{x^3-4}{x^3+2x^2+2x}dx$
$\frac { ( 1 + x ) ^ { 2 } - 1 } { x }$
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