$18x^5y^4+y^2-42x^2y$
$a^2-2a-99$
$3x^2-7xy+2x-2x^2+5x$
$tanxcos^2xcscx$
$4-7+4\cdot\left(-2\right)-\left(-10\right)$
$24x^2y^5-20x^4x^3$
$27x^3+8y^6$
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