Math, asked by deekes13206, 9 months ago

verify cos 3a=4cos^3 a-3 cos a, when a=30

Answers

Answered by Anonymous

11

Step-by-step explanation:

when , a=30

Cos(3*30) = 4Cos³30 - 3Cos30

Cos90 = 4(√3/2)³ - 3*√3/2

0 = 4*3√3/8 - 3√3/2

0 = 3√3/2 - 3√3/2 = 0

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