$\frac{\left(9+7\right)}{2}\cdot9$
$3x^2y^5-2xy^4+6x^{10}y^2$
$10xy+5b$
$2sinx=\cos^2x+2$
$15x^5-102x^4-21x^3$
$2\cdot\left(3+-4\right)$
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