pre cal

Choose the point on the terminal side of -45°

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asked by alex
  1. Cos(-45) = 1/sqrt2 = X/r
    x^2 + y^2 = r^2
    1^2 + y^2 = ((2)^1/2)2
    1 + y^2 = 2
    y^2 = 2-1 = 1
    Y = sqrt1 = +-1.
    Y = -1(Q4).

    P(x,y) = (1,-1).

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    posted by Henry
  2. thats not one of the answer choices

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  3. (1/sqrt2,-1/sqrt2).

    sqrt = Square root of 2.

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    posted by Henry

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