$\left(\frac{1-x}{1+x}\right)^{\frac{1}{2}}$
$\frac{x-3}{5-x}+5\frac{2x+3}{x-2}\text{. }x=-1$
$t\cdot y'+y=0$
$-\frac{725}{5}$
$\int x^2\sin10xdx$
$\lim_{x\to\infty}\left(\frac{-2x^2+1}{x^2+x}\right)$
$5a^2b-10ab^2+5a^2b^2$
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