$$3 { x }^{ 2 } + { 5 }^{ 2 } 1$$
$3x^{2}+25$
$$3x^{2}+25\times 1$$
$$3x^{2}+25$$
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$6x$
$$\frac{\mathrm{d}}{\mathrm{d}x}(3x^{2}+25\times 1)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(3x^{2}+25)$$
$$2\times 3x^{2-1}$$
$$6x^{2-1}$$
$$6x^{1}$$
$$6x$$