高中三角函数化简y=sin(2x+30°)cos(2x+30°)怎么化简得y=1/2sin(4x+60°),
高中三角函数化简y=sin(2x+30°)cos(2x+30°)怎么化简得y=1/2sin(4x+60°),
y=cos^2(2x)-sin^2(2x)=,怎么化简
函数y=cos²2x-sin²2x怎么化简
sin(x+y)sin(x-y)=k,求cos^2x-cos^2y
高一三角函数化简 sin^2(x-30)+sin^2(x+30)-sin^2(x)
Sin x-sin y=2/3 cos x-cos y=1/2 求cos(x-y)
问道三角函数题已知sin(x)-sin(y)=-(2/3);cos(x)-cos(y)=(2/3);求cos(x-y)
化简下面的三角函数f(x)=sin^2x+2√3sin(x+∏/4)cos(x-∏/4)-cos^2-√3
参数方程x=sin^2α与y=-cosαsinα化为普通方程,怎么化简?
MATLAB画图,y=sin(x)*(cos(x)-1)/((2*sin(x.^2)+4*cos(x)).^0.5)-(
求导y=(1+sin^2 x)/(cos(x^2))
y =(cos^2) x - sin (3^x),求y'