$-\frac{2\left(x^2-3x+9\right)}{\left(x^2-9\right)^2}=0$
$50,5x^2-54,3x+13,575\:=\:0$
$\int\left(6t^4+7\right)t^3dt$
$-4s+6s$
$\frac{8x^2+2x-1}{x+1}$
$\int_{-3}^2\left(e^{2x}cos\left(3x\right)\right)dx$
$\int\frac{\tan\left(x\right)}{cos^3x}dx$
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