$$.25 ( 2 T 04 )$$
$2T_{0}$
$$0.5T_{0}\times 4$$
$$2T_{0}$$
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$2$
$$\frac{\mathrm{d}}{\mathrm{d}T_{0}}(0.5T_{0}\times 4)$$
$$\frac{\mathrm{d}}{\mathrm{d}T_{0}}(2T_{0})$$
$$2T_{0}^{1-1}$$
$$2T_{0}^{0}$$
$$2\times 1$$
$$2$$
