maths

posted by Vin Mwale

if cosine A=0•8 find sine B

  1. Damon

    I guess you mean find sin A because I have no idea what B is

    cos^2 + sin^2 = 1
    0.8^2 + sin^2 = 1
    sin^2 = 1-0.64 = 0.36
    sin = +/- sqrt(0.36)

  2. Steve

    as shown above, sinA = ±0.6

    or, you can see that if you draw a triangle, it is just a scaled-down 3-4-5 triangle. so if sinA = 4/5, cosA = 3/5.

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