$\int_0^4\left(1+\sqrt{x}\right)^2dx$
$2x^2-4x+5=6$
$\int_0^{\infty}\left(1-x\right)e^xdx$
$\int\frac{4-x}{x^3\left(x+1\right)}dx$
$\frac{d}{dx}\:\frac{2x}{x^2\:+\:4}.$
$\int-9x\cdot\sin\left(10x\right)$
$1-2-50$
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