$\cos\:\left(2x\right)-2sen^2x=0$
$\:3\left(xy+yz+zx\right)$
$\frac{x^2+5x+6}{x^2-3x-10}$
$\frac{1}{2}x^2-5x=18$
$x^3-729$
$0,4a^2b-31+\frac{3}{8}ab^2-0,6b^3-0,2ab^2+\frac{1}{4}b^3\frac{2}{5}-6$
$\left(2x-10\right)^3$
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