y=xarcsin(x/2)+根号(4-x平方),求导数,麻烦写详细点,

问题描述:

y=xarcsin(x/2)+根号(4-x平方),求导数,麻烦写详细点,

dy/dx=arcsin(x/2)dx +xd(x/2) darcsin(x/2)/d(x/2) +d(4-x^2)/dx*d√(4-x^2)/d(4-x^2)
y'=arcsin(x/2)+(1/2)(1/√(1-x^2/4)) +(-2x)*(1/2)*(1/√(4-x^2))呜呜,大侠最后答案是多少呀,我不是很明白了,书最后的答案是arcsin(x/2)dy/dx=arcsin(x/2)dx +xd(x/2) darcsin(x/2)/d(x/2) +d(4-x^2)/dx*d√(4-x^2)/d(4-x^2)y'=arcsin(x/2)+x(1/2)(1/√(1-x^2/4)) +(-2x)*(1/2)*(1/√(4-x^2)) y'=arcsin(x/2)+x/√(4-x^2)-x/√(4-x^2)=arcsin(x/2)