$\lim\:_{x\to\:0\:}\left(\frac{4xy}{3x^2+y^2}\right)$
$\int\left(a^x+a^{-x}\right)^2dx$
$\frac{\left(1+sqrt\left(y\right)\right)^4\left(1+2y\right)^5}{sqrt\left(2+y\right)}$
$\left(4x^2+7\right)^2$
$2x^2-6x+2x^2-x$
$\left(3x^2-5xy\right)^2$
$2+12y+x-4y+5x$
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