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Home > PC3 > Chapter 7 > Lesson 7.1.2 > Problem 7-25


Christina is solving the equation . “That’s interesting,” she says. “Since , this must mean that  and . But that’s impossible.”.  

  1. Why is it impossible?

    What is the range of sine and cosine?

  1. What is going on here?


  1. Solve for  if .

    Using a calculator, evaluate .

    There is another solution. Use the unit circle to help you calculate the second solution.