$\left(1-\cos^2x\right)\csc\left(x\right)$
$3-\left(-20\right)$
$2r^4s^3-8r^2s^5$
$y-3\le6$
$\left(-10x^3+4x^2-5x+9\right)-\left(2x^3-2x^2+x+12\right)$
$m^3+2m^2+m+2$
$x^3+x^2-3x;\:x=2$
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