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March 27, 2017

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Angles x and y are located in the first quadrant such that sinx=3/5 and cosy=5/13.

a) Determine an exact value for cosx
b) Determine an exact value for siny

  • math - ,

    a)
    let x = the x length
    let y = the y length
    let r = the length from the origin to the x,y point.

    r^2 = x2 + y^2

    sine of x = y/r
    so y and r are given in the problem.
    solve for x.
    cosine of x = x/r

  • math - ,

    In the explanation, the angle x and the x length are different items.

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