求y= -Sinx/2(1-2Cos^x/4)的导数?(^代表平方!)
问题描述:
求y= -Sinx/2(1-2Cos^x/4)的导数?(^代表平方!)
答
(1-2Cos^x/4)在分母上么?
答
cos^x/4是什么? cos(x/4)^2吗?
答
根据你的题目,我把你的式子改成标准写法:y=-sin(x/2)*(1-2(cos(x/4)^2))所以y'=-(1/2)*cos(x/2)*(1-2(cos(x/4)^2))-sin(x/2)*(-2*2cos(x/4)*(-sin(x/4))*(1/4))=-(1/2)*cos(x/2)*(1-2(cos(x/4)^2))-sin(x/2)*(c...