Please tell me where I went wrong.
Thanks
For starters your terminology, um..., stinks. You still have an integral sign AFTER you integrated!! I don't have the fancy fonts, but let me rewrite this.
Iave = 1/(1/300 - 0)*Int[2*sin(600t) dt, 0, 1/300]
= 300*2*Int[sin(600t) dt, 0, 1/300]
Let x = 600t ==> dx = 600 dt
Iave = 300*2*Int[sin(x) * (dx/600), 0, 2] <-- Watch your limits of integration!
= Int[sin(x) dx, 0 ,2]
= -cos(2) + cos(0)
= 1 - cos(2) = 1.41615 A
(Your given answer of 0.46 A is incorrect.)
-Dan