Question

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Answer 1

Step-by-step explanation:

$3 \sin(6°) - 4 \cos^{3} (84°) \\ = 3 \sin(6°) - 4( \cos(90 - 6)° ) ^{3} \\ = 3 \sin(6°) - 4 \sin^{3} (6°) \\ = \sin(3 \times 6) \\ = \sin(18°) \\ = 0.309$

$3 \sin(A) - 4 \sin^{3} (A) \: = \sin(3A)$

This is required ans.....

Answer 2

Answer:

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