Verify sin 3x = 3sin x- 4sin³ x by taking x= 30°.
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L.H.S
= sin 3 × 30° [∵ Given x = 30°]
= sin 90° = 1
R.H.S
. = 3 sin x – 4 sin3 x
= 3sin 30° – 4 sin3 30°
=1
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