Evaluate Sine Cosine Tangent Unit Circle

In which two quadrants is inverse cosine defined?

• Quadrant I

• Quadrant II

• Quadrant III

• Quadrant IV

Answer explanation

Remember, the range of inverse cosine is restricted from [0, pi] (only Quadrants I and II!)

 Find sinC

• 21/35

• 28/21

• 35/28

• 28/35

Using the unit circle. In which quadrant on the unit circle is sine positive? 

• I and II

• II and III

• III and IV

• I and III

Using the unit circle. In which quadrant on the unit circle is cosine positive?

• I and II

• II and III

• I and IV

• I and III

• 44.55
• 22.69
• 41.66
• 38.49

Based on the unit circle, what is the value of cos?

• y

• x

• x/y

• y/x

If you are given the two sides that are not the hypotenuse, which trig function should you use?

• sine

• cosine

• tangent

• cotangent

• 20.35
• 12.72
• 14.99
• 21.83

Evaluate cos (135°)