$a^2-b^2n^6$
$\cos a=\left(-05\right)$
$\sin\left(2a\right)-sin\left(a\right)=0$
$4+37uv-4uv-33uv$
$-5x^2+4y+3x^2-2y$
$x^2y-y-zy$
$63x\:3\:-86x\:2+3x+20$
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