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Home > PC > Chapter 4 > Lesson 4.1.4 > Problem 4-55


In a unit circle, what is the radius?

You have two sides of a right triangle. Find the third side, which is the x-coordinate.

In Quadrant III, sine and cosine are both negative.
In which quadrant is sine negative and cosine positive?

In which quadrant is cosine negative and sine positive.