$sec^4+sec^2$
$\int\frac{2x^3-3x^2-x+1}{x^2-x+1}dx$
$\left(-2^2\right)-3\:\left(-1\right)\:$
$f\left(x\right)=xsen^2x$
$\int - 45 d x$
$45x^2+20x+24$
$\int_3^{\infty}x^2\left(2x+5x^3\right)dx$
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