$x^2+7x+20$
$64^4-x^2$
$x+8=3x+4$
$2x^4+40x^216$
$3a^3+8b^4\cdot3a^3+8b^4$
$sen45=\frac{4}{x}$
$\int e^{-50}sin10xdx$
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