$4\left(5-x^2\right)=16$
$\frac{3x^2}{4-x^2}$
$\sec x-\tan x\cdot\csc x+1=\cot x$
$\left(10y^{11}-5y\right)\left(10y^{11}+5y\right)$
$\left(3x^5\right)\left(6x^4+x\right)^4$
$2x^2-12x+29$
$10m^2-13mn-3^2$
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