$15-\left(-2+9\right)$
$cos\left(x\right)=-\frac{1}{\sqrt{2}}$
$4x+12+x=27$
$\frac{x^3+x}{2x^2+1}$
$26+n=59$
$\tan2\left(x\right)-\frac{\sqrt{3}}{3}=0$
$3e^{xy}-x=0$
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