$f\left(x\right)=x^7-2x^6+3x$
$x^2-20x-10$
$\left(5x^6-15\right)^2$
$\left(x\:+9\right)^2$
$5\cos^2b=4$
$\int\left(5\sqrt{t+2}\right)^{-2}t^{-\frac{1}{2}}dt$
$\lim_{x\to4}\frac{x^2-7x+12}{x-4}$
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