$$2+1+x-1$$
$x+2$
$$3+x-1$$
$$2+x$$
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$1$
$$\frac{\mathrm{d}}{\mathrm{d}x}(3+x-1)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(2+x)$$
$$x^{1-1}$$
$$x^{0}$$
$$1$$
