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Home > A2C > Chapter 13 > Lesson 13.1.1 > Problem 13-16

13-16.

If , what must be true about the sign of: Homework Help ✎

Graph each function using the input bar below or on your graphing calculator. What do you observe about the -values when is between and /2?

When graphing using the input bar, sin() is equivalent to sin().    

  1. sin(θ)

    The -values are negative.

  2. cos(θ)

    Use the same method as part (a). It might also help to think about how the sin() and cos() graphs relate to each other.

  3. tan(θ)

    Use the same method as part (a).

    Negative

  4. Does taking the reciprocal of something change its sign?