应该是已知条件敲错了，少了一个t, 应为I(t)=2sin【(2π/T）t-π/4】所以当t=0时，有I(t)=2sin【(2π/T）*0-π/4】=2sin(0-π/4)=2sin(-π/4)=2*(-√2/2)=-√2当t=T/8时，有I(t)=2sin【(2π/T）*T/8-π/4】=2sin(π/4-π/4)=2sin0=0
