$${ a }^{ 2 } + { a }^{ 2 } +1$$
$4a$
$$\frac{\mathrm{d}}{\mathrm{d}a}(2a^{2}+1)$$
$$2\times 2a^{2-1}$$
$$4a^{2-1}$$
$$4a^{1}$$
$$4a$$
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$2a^{2}+1$
$$2a^{2}+1$$