$$\frac{\varphi}{6}-\frac{\varphi}{8}=$$
$\frac{1}{24} = 0.041666666666666664$
$$\frac{\mathrm{d}}{\mathrm{d}\phi }(\frac{1}{24}\phi )$$
$$\frac{1}{24}\phi ^{1-1}$$
$$\frac{1}{24}\phi ^{0}$$
$$\frac{1}{24}\times 1$$
$$\frac{1}{24}$$
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$\frac{\phi }{24}$
$$\frac{1}{24}\phi $$
