$\frac{27a^6-b^3}{3a^2-b}$
$5x^2-15x+10$
$\int e^{-15x}dx$
$\int\frac{3}{x^{2}-1}dx$
$\frac{1}{2}\left(1-2\sin^2\left(x\right)\right)-\frac{1}{4}$
$\left(1-sen\:a\right)\left(1+tan^2a\right)$
$s\left(t\right)=\frac{2t}{\sqrt{t}^2}-4$
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