$2\int\frac{2x}{1+x^2}dx$
$\left(-5x^{2}+x^{3}-2x+3\right)-\left(-5x^{2}-x^{3}+4x+8\right)$
$\cos\left(-x\right)-sin\left(-x\right)=cos\:x\:+\:sin\:x$
$\frac{\left(-2\right)^4.3^5.\left(-2\right)^8}{\left(-2\right)^7.3^3}$
$\sqrt{12^2}+9^2$
$36a^2-1$
$120-0.49y\int_0^{\infty}\left(x^{-0.5}.e^{-e}\right)dx$
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