$3tan2x\:=\:1$
$\int\frac{2x^2-4x-8}{\left(x+1\right)\left(x^2+4\right)}dx$
$-5x^3-5x^2+60x$
$7\sqrt{5}\cdot4\sqrt{5}\cdot2\sqrt{4}$
$\int\left(x+2\right)e^{x^2+4x-5}dx$
$\int\frac{\ln\left(7x\right)^3}{x}dx$
$\frac{dy}{dx}x^3+4x^2y=e^{-x}$
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