$\cos^2x+2\sin x+2$
$-2\left(x+4y\right)\left(2x-3y\right)$
$\left(3x^2+5y\right)^2$
$\left(3k^{4}\right)^{4}$
$\frac{y^2+3y+2}{y^2-1}$
$\frac{3x^2}{x^2+2}$
$6+z+z^2+4z$
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