若0≤x≤n,则方程2乘cosx+1=0的解x=
问题描述:
若0≤x≤n,则方程2乘cosx+1=0的解x=
答
cosx=-1/2
得x=2π/3
若0≤x≤n,则方程2乘cosx+1=0的解x=
cosx=-1/2
得x=2π/3