$$7 x _{ 2 } 3 x _{ 2 }$$
$21x_{2}^{2}$
$$7x_{2}^{2}\times 3$$
$$21x_{2}^{2}$$
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$42x_{2}$
$$\frac{\mathrm{d}}{\mathrm{d}x_{2}}(7x_{2}^{2}\times 3)$$
$$\frac{\mathrm{d}}{\mathrm{d}x_{2}}(21x_{2}^{2})$$
$$2\times 21x_{2}^{2-1}$$
$$42x_{2}^{2-1}$$
$$42x_{2}^{1}$$
$$42x_{2}$$
