$x^4-6x^2+9x^2$
$\frac{1}{\sin\left(x\right)+\tan\left(x\right)}$
$\left(2m^5+3\right)^2$
$4cos^3x-cosx=0$
$1\cdot7-8+8$
$-2y-xy+x^2-y$
$r^2-16r+63$
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