$\sin\left(x\right)=\frac{84}{85}$
$x^2+36x$
$\frac{49x^2-14x+1}{\left|1-7x\right|}$
$f\left(x\right)=\frac{x}{\left(1+8x\right)^2}$
$20x^2-10x+1$
$\int\frac{x^2-2x-4}{\left(x+1\right)^2\left(x+2\right)}dx$
$\int\left(\frac{x^{2}-4x-12}{x+2}\right)dx$
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