$8a^3-36^2b+54ab^2-27b^3$
$4x+1\ge9$
$40\cdot\frac{7}{8}$
$secxdy=xcotydx$
$x^4y^3+12x^2$
$2x+4=3x-18$
$\frac{2\pi}{\left(\frac{x}{3}\right)}$
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