$x r = 4 y$
$\left(x^n+y^{2n}\right)^4$
$4\sin\left(x\right)+\sqrt{3}=0$
$\int x^2\sin\left(6\right)dx$
$7\:\cdot229$
$\left(x^2+25\right)\left(x^2+1\right)$
$-4\cdot x^4-y^4$
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