$\left(r-1\right)\left(2r-5\right)$
$\frac{\left(sin^2x\right)}{csc^2x}$
$4m^2\sqrt{12bc^2}$
$\lim_{x\to0}\left(\frac{2^x-12^x}{x}\right)$
$+20\:+30\:+50\:-10$
$-41\cdot12$
$\frac{3x^2-27x+24}{2x^3-16x^2+14y}$
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