$\left(4x^2-y^3\right)^4$
$\sin\left(x\right)\cos\left(y\right)dy-\sin\left(y\right)\cos\left(x\right)dx$
$4x^4+17x^3+10x^2-7x+18\:\:$
$\frac{x^4+2}{x^2+2x+1}$
$\left(10m+6\right)^2$
$2b+5a-b$
$81t^2+72+16$
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