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4-25.
  1. Given: cos θ = . Homework Help ✎

    1. Draw a right triangle and place values on the sides so that cos θ = .

    2. Draw a unit circle diagram to clearly show the TWO possible positions for θ.

    3. Use the Fundamental Pythagorean Identity or a right triangle to find all possible values for sin θ.

    4. Find all possible values for tan θ.

It must be a 3-4-5 triangle because of the Pythagorean Theorem. Determine the two sine values.