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Home > INT3 > Chapter 10 > Lesson 10.3.2 > Problem 10-168

10-168.
  1. Without a calculator, what are two solutions to each of the following equations for 0º ≤ θ < 360º? Homework Help ✎

    1. cos(θ) =

    2. tan(θ) = –1

    3. sin(θ) =

    4. cos(θ) = –

Draw a unit circle.

Answers: 60° and 300°

135° and 315°

Draw and label a unit circle as in part (a). Don't forget that the sine is the y-value! Which quadrants will the angles be in?

See part (c).