Taking A=30° verify cos3A=4cos^3A
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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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