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Solution:
We can find the value by using the trigonometric identity of sin3x
As per trigonometric identity, we have
sin 3x = 3sin x - 4sin3 x
On transposing terms,
4 sin3 x = 3sinx - sin 3x
Divide both sides of the equation 4 sin3 x = 3sinx - sin 3x by 4,
sin3x = (3sinx - sin 3x)/4
Hence the formula for sin3 x is (3 sinx - sin 3x) /4.
Summary:
The formula of Sin3x is (3 sinx - sin3x)/4