cos 3 x = 4cos ^3 x - 3cos x, x = 30
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Step-by-step explanation:
L.H.S
=>cos 3*30°
=>cos 90°
=>0
R.H.S
=>4cos³ x- 3cos x
4cos³ 30°- 3cos 30°
=>4×(√3/2)³-3×√3/2
=>4*3√3 -3√3
8 2
=>12√3 -4(3√3)
8
=>12√3-12√3
8
=>0/8=0
hope it helps ☺️
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