$\left(3x^3+3\right)$
$\int\frac{1}{\left(x-4\right)\left(x-1\right)}dx$
$5xy-8x^3;\:x=4;\:y=-1$
$tg\:a^2=\frac{\sin^2a}{1-sen^2\:a}$
$\frac{49x^5w^{-13}z}{21x^2w^{-8}z^6}$
$\:x^2+y^2+x+y=4$
$\lim_{x\to-\infty}\left(x+\sqrt{x^2+2x}\right)$
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