$\left(-2\right)\:x\:\left(+3\right)$
$1,2x^2-0,3x+1$
$x^2-2x=8$
$3x^5-x^3$
$cotx\left(tanx-secx\right)$
$\sqrt{2-2cos\left(4x\right)}$
$y+3x^2y=10x^2$
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