My first question(well more of a check whether im doing it correctly) is to work out the mean value of the waveform V(t)=Acos(Wt)

Here is my solution:

_ T

V = 1/T ∫ Vdt where T= 2∏/W

0

_ 2∏/W

V = W/2∏ ∫ Acos(Wt)dt

0

_ 2∏/W

V = W/2∏ [AsinWT/W ]

0

_ 2∏/W

V = A /2∏ [sinWT ]

0

_

V = A /2∏ [sin2∏ -sin(0) ]

_

V = A /2∏

Does the final answer seem correct? I only question this because squaring the above, does not give me the correct answer of :

_

V = A^2 /2

Please tell me what I am doing wrong! Thanks