Engineering Board Exam Reviewer · Trigonometric Identities · easy
Find the exact value of 15°.
- sqrt(2)4 + sqrt(6)4 0.966
- - 1/2 + sqrt(3)2 0.366
- sqrt(2)4 0.354
- - sqrt(2)4 + sqrt(6)4 0.259
Answer
D. - sqrt(2)4 + sqrt(6)4 0.259
Solution
15°= (45°-30°)= 2/2· 3/2- 2/2· 12= 6- 2/4.
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