1 Answer

Tim Long · Answer 1 · 2023-03-05T20:09:16+0000

Answer:
- 0.944

Explanation:
We know that,
cos 3A = 4 cos³A - 3 cos A (formula)

So,
If cos A = 0.4,

cos 3A = 4 cos³A - 3 cos A
cos 3A = 4 × (0.4)³ - 3 × (0.4)
cos 3A = 4 × 0.064 - 1.2
cos 3A = - 0.944

Hope it helps ⚜

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