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