$-9x+7+3x-8$
$f\left(x\right)=\frac{\left(x+1\right)^8}{\left(3x-12\right)^{10}}$
$\left(2sinx+2cosx\right)^2=4+4sin^2x$
$\left(4a-b\right)\left(3a-b\right)$
$\left(\frac{1}{5+x}\right)^2$
$x^2+2x=63$
$\lim_{x\to4}\left(\frac{\sqrt{x+3}-2}{x^2-1}\right)$
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