Question

1. If sin =1/2and is acute, then (3 cos − 4 cos3 ) is equal to ___________
(a) 0
(b) 1/2
(c) 1/
(d) −1

Answer 1

Answer:

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Answer 2

Answer:

Step-by-step explanation:

sin Ф = 1/2

sin Ф = sin 30°

Ф = 30°

3cosФ - 4cos³Ф

3cos30° - 4cos³ 30° = 0