$\int\frac{2x+1}{\left(x+1\right)\left(x+3\right)}dx$
$10x^2+21x-10$
$\int\left(3x^5-3x^3+1\right)dx$
$\left(3m^2-8n^4\right)^2$
$-50\cos\left(x\right)\cos\left(5x\right)$
$\left(-6x^2+5x+4\right)$
$f\left(x\right)=x^2-3x$
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