[tex]\displaystyle\bf\\y=5x^{4} +2\\\\y'=5\cdot\Big(x^{4} \Big)'+2'=5\cdot 4x^{3} +0=20x^{3} \\\\Otvet \ : \ \boxed{y'=20x^{3} }[/tex]
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[tex]\displaystyle\bf\\y=5x^{4} +2\\\\y'=5\cdot\Big(x^{4} \Big)'+2'=5\cdot 4x^{3} +0=20x^{3} \\\\Otvet \ : \ \boxed{y'=20x^{3} }[/tex]