$x^4+4x^3-x^2-20x-20$
$-5ab\:para\:a=1,\:b=2\:$
$x^2+10x+x$
$\left(10\left(-0.15\right)^2+3\left(-0.15\right)-4\right)$
$\int\left(\frac{7}{3x}\right)dx$
$\int\left(5x^2\right)\left(x^4+2\right)dx$
$\left(1-\frac{sinx}{cosx}\right)\left(1+\frac{cosx}{sinx}\right)$
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