$3a+b-2b$
$2y-y+7-1+3+7x^2-4y$
$8\left(6\:-\:2\right)\:$
$\left(x^3y\:-2xy\right)^2$
$\left(n^4-2n^2+1\right)\left(n^4+14n^2+49\right)$
$\left(3x^4+2x^3-x^2+5\right)-\left(2x^2+3\right)$
$\frac{1}{\cot^2\left(x\right)}+\frac{1}{\sin\left(x\right).\csc\left(x\right)}$
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