Engineering Board Exam Reviewer · Inverse Trigonometric Functions · easy

Evaluate ≤ft(- 12 ) in degrees (principal value).

1. 60°
2. 120°
3. 150°
4. 240°

Answer

B. 120°

Solution

The principal range of is [0°,180°], and 120°=- 12, so the value is 120°.

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