$x^2+9x-18$
$2\:+6\:-4\:+1$
$3+\frac{2}{x^2}-3x^4$
$2\sin\left(t\right)\left(-\sin\left(t\right)\right)+4\cos\left(t\right)$
$a^4x-b^4x-2b^2x$
$sec\left(45\right)+sen\left(45\right)$
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