$e^x-e^x$
$abc\:x\:cd$
$\left(-43\right)\left(-36\right)$
$-2<\frac{6-2x}{4}$
$45+4x^{a+2}-x^{2\left(a+2\right)}$
$2sec\left(x\right)+5=9$
$49-x^2$
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