$${ x }^{ 2 } + { 4 }^{ 2 } - { 3 }^{ 2 }$$
$x^{2}+7$
$$x^{2}+16-3^{2}$$
$$x^{2}+16-9$$
$$x^{2}+7$$
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$2x$
$$\frac{\mathrm{d}}{\mathrm{d}x}(x^{2}+16-3^{2})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(x^{2}+16-9)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(x^{2}+7)$$
$$2x^{2-1}$$
$$2x^{1}$$
$$2x$$
