$x^2+x-1\cdot2x^2-x+-3x+3$
$x-6>21-8x$
$\left(\frac{x}{3}-\frac{y}{4}\right)\left(\frac{x}{3}+\frac{y}{4}\right)$
$\cos=0.79$
$\left(n-9\right)\left(n+9\right)$
$\left(3x^4y\right)^2\cdot y^8$
$\int\frac{\left(x^2+9\right)^{\frac{1}{2}}}{x^4}dx$
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