Question

please answer this question.
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Answer 1

Answer:

0

Step-by-step explanation:

If sinФ = 0.5

Ф = 30°

cos30° = (√3)/2

4 cos³30° - 3 cos30° = (4*3√3)/8 - (3√3)/2 = 0

Hence, Proved.

P.S. : You can also use 4cos³Ф - 3cosФ = cos3Ф

So 3Ф = 90°

cos 90° = 0

MARK IT AS BRAINLIEST !!!

Answer 2

namaste ^_^

wait

I will do it now in my notebook....

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hope it will help you...

mark it brainlist