### Home > CCA2 > Chapter 9 > Lesson 9.1.1 > Problem 9-11

9-11.

Solve each equation for 0 ≤

*θ*≤ 360. You may need your calculator, but remember that your calculator only gives one answer. Most of these problems have more than one answer. Think about all four quadrants. Homework Help ✎sin

*θ =*0.5cos

*θ*= −0.54 tan

*θ*− 4 = 03 sin

^{2}*θ*= 1

Where is the sin*θ* = 0.5? Remember sin is the *y*-value. What would *θ* be at those places?

*θ* = 30° *θ* = 150°

Where is the cos*θ* = −0.5? Remember cos is the *x*-value. What would *θ* be at those places?

Solve for the tan*θ*. Draw a unit circle. Where is the tan*θ* of that value?

Use your calculator to get one of the values. Then use symmetry to get the other 3 values. There are 4 values because when you take the square root of both sides the answer would be plus or minus!