跪求u=u2(x) u2(y) u2(z)y=cosx=sin(x 丌/2)

问题描述:

跪求u=u2(x) u2(y) u2(z)y=cosx=sin(x 丌/2)
f(-x 5)=—f(x 5)还是—f(x-5)f{x}=lg{2x -3}

x=1 rcosA,y=-1 rsinA,|ax b|0)对比A=2×2×3×5×7,B=2×3×3×5×7对比x=1 rcosA,y=-1 rsinA,