Question 44
TrigonometryEvaluate without using tables sin(−1290°)
- A.√3/2
- B.√(2/3)
- C.√2/2
- D.1
- E.½.
Show the answer and explanation
Answer: E (½.)
Explanation
sin(−1290°) = −sin 1290°. 1290° − 3 × 360° = 210°, and sin 210° = −½, so the value is ½.
Evaluate without using tables sin(−1290°)
Answer: E (½.)
sin(−1290°) = −sin 1290°. 1290° − 3 × 360° = 210°, and sin 210° = −½, so the value is ½.