Question

Taking A=30° verify cos3A=4cos^3A

Answer 1

HEY MATE HERE IS YOUR ANSWER ⭐

Given A=30

A= 30°

cos(a) = √3/2

4cos³(a) - 3cos(a) = 4(√3/2)³ - 3cos(a)

= 4(√3³)/2³ - 3√3/2

= 3√3/2 - 3√3/2

= 0

cos(3a) = cos(90°) = 0

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Answer 2

Answer:

Please find the attached image.

Step-by-step explanation: