$4cos^2x-3=0$
$-5<x:2-3$
$5^0+4$
$3\left(8b+5\right)+b$
$\frac{2x^2-6x+5}{x+2}$
$\frac{y^2+3y-11}{y+5}$
$\frac{4x^3-x}{2x+3}$
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