$\frac{x^2+4}{x^2\left(x-4\right)}$
$2\cot^2x+2\csc^2x=11\csc x-8$
$3x-5yx+3y-5y^2$
$8-2x\cdot15-2x$
$\left(2x+1\right)e^{0.1x}$
$2yz^4-50yz^2$
$5x^2+5x^2$
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