$$3x \times 5x$$
$15x^{2}$
$$3x^{2}\times 5$$
$$15x^{2}$$
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$30x$
$$\frac{\mathrm{d}}{\mathrm{d}x}(3x^{2}\times 5)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(15x^{2})$$
$$2\times 15x^{2-1}$$
$$30x^{2-1}$$
$$30x^{1}$$
$$30x$$