$2x^2+5x^2-4x^2$
$\int\left(\frac{t^4}{t^2-1}\right)dt$
$125m^{15}+216n^3$
$\left(x+y+1\right)\left(x-2\right)$
$\lim_{x\to0}\left(\frac{2x+sinx}{x^2+x}\right)$
$\int_1^{\infty}\left(\frac{1}{x^2\sqrt{x^2-1}}\right)dx$
$\int ln\:x^3dx$
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