设函数为 y(x)=sin² x,求x*点处曲线的斜率.1,曲线y(x)在 x*处的切线的斜率就是y(x)的导数y’(x)在x处的函数值：y'(x*)；2,计算导数：y'(x) = 2sin x cos x = sin (2x)3,曲线y(x)在x*处切线的斜率等于：y'(x*)；...