[tex]\displaystyle\bf\\(Cos^{4} x)'=4Cos^{3} x\cdot(Cosx)'=4Cos^{3} x\cdot(-Sinx)=\\\\\\=-4Cos^{3} x \ Sinx[/tex]
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[tex]\displaystyle\bf\\(Cos^{4} x)'=4Cos^{3} x\cdot(Cosx)'=4Cos^{3} x\cdot(-Sinx)=\\\\\\=-4Cos^{3} x \ Sinx[/tex]