Pre calc

Find sin(2x), cos(2x), and tan(2x) from the given information.
sin(x) = 5/13, x in Quadrant I

I honeslty just need one good example of how to do these please show all work and finalize answer

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  1. In QI, you have

    sinx = 5/13
    cosx = 12/13
    tanx = 5/12

    sin2x = 2sinx cosx = 2(5/13)(12/13) = 120/169

    similarly using the other double-angle formulas.

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  2. How did you know ot multiple it with cos

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  3. because I studied the double-angle formulas, as you need to do!

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  4. Ok I know that the equation for
    cos(2x)=1-2sin^2(x) How would you plug that in? It will not work

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