化简求值:(x^2-xy)*(y/x -y/x-y),其中x=sin45,y=tan60
问题描述:
化简求值:(x^2-xy)*(y/x -y/x-y),其中x=sin45,y=tan60
答
x=√2/2,y=√3
原式= x(x-y)[y(x-y-x)/x(x-y)]
=-y^2
=-3