$-5y\:-\:15y\:+\:2\:-\:2$
$y^3-2y^2-4y+8$
$3cos^2x-4sec^2x+3sin^2x+4tan^2x$
$12x-3\:>6x\:-2$
$\sin\left(3x\right).\cos\left(8x\right)$
$x^4\cdot x^5\cdot x^7$
$-21+7\cdot\left(-2\right)$
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