$\left(x+2\right)^2-3=x^2+17$
$\:3x^2+9x+x+3$
$\frac{sin\left(x\right)-cos\left(x\right)}{1-cot\left(x\right)}$
$\left(-4\right)^8$
$\left(a\:+5\right)\:\left(a\:-5\right)$
$x^2+6x=40$
$\lim_{x\to0}\left(x+\frac{4}{x}\right)^x$
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