$2x^2-10x^2$
$\left(4x^2-8x^3y\right)\left(4x+3y^4-2z^4\right)$
$x^2-\frac{x}{1}$
$4x^2-1=0$
$b^2,b=2$
$3\sec^2x=5\left(1+\tan x\right)$
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