$-4y^2+5x^4+6y^2-8x^4+x^4-2y^2$
$4\cdot5+2nx2+nx$
$\int _ { 1 } ^ { x ^ { 2 } } t d t$
$x^2+42x+441$
$9y^2-18y$
$2=\frac{a+b}{\cos\left(x\right)}$
$-12xy^2z^7-12z^4$
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