Algebra 2 help?

For an angle θ with the point (15, −8) on its terminating side, what is the value of cosine?

2 Answers

  • Hyp = sgrt(15^2+8^2) = sqrt(289) = 17

    so cos(θ) = 15/17

  • I have no theta so I use t.

    cos(t) = 15[15^2 +8^2]^(-1/2) = 15(289)^(-1/2) =

    (15/17).

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