$\int\frac{11}{x\left(x+21\right)}dx$
$\int\left(\frac{3t^3}{\left(t^3+1\right)}\right)dt$
$\left(x-10\right)\left(x-5\right)$
$x=y^6$
$\frac{x^4-4^4}{x-4}$
$cos^2x-sinx=1-2sin^2x$
$\frac{7}{x+5}-\frac{3}{x-5}=\frac{30}{x^2-25}$
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