[cos(d圆周率
[cos(d-圆周率/2)/sin(4.5圆周率+d)]*sin(d-4圆周率)*cos(2圆周率-[cos(d-圆周率/2)/sin(4.5圆周率+d)]*sin(d-4圆周率)*cos(2圆周率-d) d为一个锐角
[cos(d-π/2)/sin(4.5π+d)]*sin(d-4π)*cos(2π-d) =(sind/cosd)sindcosd =(sind)^2
答:求COS(Π/17)*COS(2Π/17)*COS(4Π/17)*COS(8Π/17)的值 设S=COS(Π/17)*COS(2Π/17)*COS(4Π/17)...详情>>
答:详情>>