$\frac{x^4-1}{x^3+x^2+x+1}$
$\int\frac{x+9}{x^2+5x}dx$
$-7-3\left(x+2\right)-3x$
$\int\frac{2.e^{2x}+3.e^x}{e^{2x}+2}dx$
$x6\:\left(4x\:+\:6xy\right)\:=\:$
$7x^2-24x+18$
$\left(e-11n\right)^2$
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