$\sec\left(1.23\right)$
$m^2+2m+18$
$sin\left(2x\right)+2sin\left(\frac{x}{2}\right)cos\left(\frac{x}{2}\right)=0$
$2y-5y$
$\frac{1^1+a^3}{1+a}$
$p\left(x\right)=x^{3\:}-13x^2+36x$
$\left(1+\tan^2\left(x\right)\right)\left(1-\tan^2\left(x\right)\right)$
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