$\lim_{x\to1}\left(\frac{\left(2x+3\right)\left(\sqrt{x-1}\right)}{2x^2+x-3}\right)$
$\left(\frac{1}{2}a^2+\frac{2}{3}b^2\right)^2$
$\lim_{n\to\infty}\left(1+\frac{1}{2n}\right)^n$
$\int\left(1-\sin2x\right)^2dx$
$\int x^{20}dx$
$\left(3x^9y\right)^4$
$18+3a$
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