Question

IF x = 30 VERIFY THAT
Cos 3x = 4 cos³x -3x cos x​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

L.H.S. : cos3×30 = cos90 = 0

R.H.S. : 4 cos³30-3cos30

=> 4×(√3/2)³-3×√3/2

=> 3√3/2-3√3 /2

=> 0

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