Question
Use the diagrams drawn in Exercises 3 and 4 to help you find the exact value of each function. Do not use a calculator.$$\cos \left(-120^{\circ}\right)$$
Step 1
Step 1: First, we need to understand that the cosine function gives us the x-coordinate of the point on the unit circle that is $-120^{\circ}$ counterclockwise from the positive x-axis. Show more…
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