Trig Functions Of Acute Angles Worksheet Page 6
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16Ex4: Evaluating an Expression with Function Values of Special Angles
2
Evaluate: cos 120˚ + 2sin
60˚
tan 30˚.
2
2
Classroom Ex4: Evaluate: sin
45˚ + 3cos
135˚
2tan 225˚
Ex5: Using Coterminal Angles to Find Function Values
Evaluate each function by first expressing in terms of a function of an angle between 0˚ and 360˚.
1)
cos 780˚
2) cot ( 405˚)
3) sin 585˚
4) cot ( 930)
Ex6: Finding Angle Measures, Given an Interval and a Function Value
Find all values of θ, if θ is in the interval [0, 360) (
) and
** between 0 and 360
1)
cos θ =
2) sin θ =
Chapter 2 Page 6
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