I have used the relation
I am having some problems with my trig revision. It's been such a long time since I've done this I have completly forgot exactly what I am supposed to be doing with this! If someone could walk me through the first question I hope I'll be able to pick it up from there!
The Power P in an alectrical circuit is given by P = v squared/R
Find the power in terms of V, R and Cos2t when v = VCost