$\left(\frac{4}{x}-x\right):\left(\frac{1}{x}+\frac{1}{2}\right)$
$5y^2+30y+9$
$\int_{ln5}^{ln7}\left(e^{-x}\right)dx$
$\frac{-5x^3-10x^2-5x-10}{-2x}$
$x^4-x^2-20$
$\int csc^43xdx$
$sen\:3x+2=0.529919264$
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