$-41.1\:+\:22,1$
$\left(\frac{2}{3}a+5b\right)$
$6xy^3+3xy^2-3x\:^2y$
$\lim_{x\to0}\left(\frac{e^2-\cos\left(x\right)}{x.\tan\left(x\right)}\right)$
$\cos^2x-3\cos x=-2$
$5x^2+21x+15$
$\int_1^{+infinito}5xdx$
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