$\frac{x^4+2}{x^2+5x+1}$
$\frac{16}{9}x^2+\frac{8}{3}xy+4y^2$
$-98x^2+8v^2$
$770-360$
$30+32x+2+40x$
$\frac{4}{5}-x^2.8x^3-5x+3$
$\left(4k^2+5j^2\right)^2$
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