Question

If sin A=1/2, then show that 3 cos A- 4 cos3 A = 0 ​

Answer 1

Answer:

sin A=1/2

A=30°

cos A=cos 30=√3/2

cos³A=cos³30=3√3/8

3 cos A-4cos³A

=3×√3/2-4×3√3/8

=3√3/2-3√3/2

=0

Thus proved

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Answer 2

Answer:

✏ANSWER✏:-

attached above⬆⬆✔✔

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