$$3\times s\frac{\alpha}{s}$$
$3\alpha $
$$\frac{3\alpha }{s}s$$
$$3\alpha $$
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$3$
$$\frac{\mathrm{d}}{\mathrm{d}\alpha }(\frac{3\alpha }{s}s)$$
$$\frac{\mathrm{d}}{\mathrm{d}\alpha }(3\alpha )$$
$$3\alpha ^{1-1}$$
$$3\alpha ^{0}$$
$$3\times 1$$
$$3$$
