y=4cos(x/3),0

y=4cos(x/3),0 求函数y=4cos(x/3),0 求y=4cos(x/3) 0 【高中数学】已知cos(x+y)=1/3,cos(x-y)=2/3,且0 已知cos(x+y)=1/3,cos(x-y)+2/3,且0 化简y=(2cos^4x-3cos^2x+1)/cos2x 若cos(x+y)cos(x-y)=1/3,则cos^x-sin^y=?^为平方 Sin x-sin y=2/3 cos x-cos y=1/2 求cos(x-y) y=cos(2x-派/4 0 求函数的导数y=cos(4-3x) Y=cos(3x-π/4)的导数 y=cos(4-3x),求微分 函数y=-cos根号x(0 函数y=cos(x+b)(0 y=cos(π/4-x)求导 y=cos(3x) 的微分 y=cos x/3 的周期 求解微分方程xy'ln(x)sin(y)+cos(y)(1-x*cos(y))=0