$\sqrt{40-x^2}+4=x$
$-17.200+-8.930$
$f\left(x\right)=\left(x+2\right)e^{-2x}$
$\frac{1}{2}a-\frac{1}{4}b+\frac{1}{4}c-\frac{1}{4}a+\frac{1}{3}b+\frac{1}{2}c-a+b+c$
$x^2-4x-60$
$\int\frac{sen^2xcotx}{secx}dx$
$x^2-3x=-40$
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