[tex]\displaystyle\bf\\y=-3Cos2x\\\\\\y'=\Big(-3Cos2x\Big)'=-3\cdot\Big(Cos2x)'=\\\\\\=-3\cdot\Big(-Sin2x\Big)\cdot(2x)'=3Sin2x\cdot 2=6Sin2x[/tex]
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[tex]\displaystyle\bf\\y=-3Cos2x\\\\\\y'=\Big(-3Cos2x\Big)'=-3\cdot\Big(Cos2x)'=\\\\\\=-3\cdot\Big(-Sin2x\Big)\cdot(2x)'=3Sin2x\cdot 2=6Sin2x[/tex]