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Math Help - Trigonometric Methods

  1. #1
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    Post Trigonometric Methods

    Hi all,
    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


    Thanks!
    MM
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  2. #2
    Lord of certain Rings
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    P = \frac{v^2}{R} =\frac{(V \cos t)^2}{R}=   \dfrac{V^2 \frac{1+\cos 2t}2}{R} = \dfrac{V^2(1+ \cos 2t)}{2R} I have used the relation \cos 2t = 2 \cos^2 t - 1
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