$\left(9y^2-4\right)\left(9y^2-4\right)$
$3x^4+x^3-\left(8x+x^2+7\right)-12x+7$
$y=ln\left(x\cdot cos\left(x\right)\right)+5^{-x}$
$\left(4a^0\right)^4$
$\int\left(\frac{x^2-1}{x^3-x}\right)dx$
$21x+8x-x+3$
$\frac{x}{3-x}<2$
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