$\lim_{x\to0}\left(\frac{\sec\left(x\right)-1}{x\sin\left(x\right)}\right)$
$x^2-36x+144$
$x=\frac{-3y+3y^2+6}{3}$
$z^6y^8-1$
$\left(5a^2b-6ab^3\right)^2$
$4+2-5-\left(-1\right)$
$\left(5x^3+7\right)^2$
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