Q. 21 A4.4( 7 Votes )

# If x = 30°, then

For x= 30°,

LHS = sin (3×30°)

= sin (90°)

=1

RHS = 3sin30° - 4× (sin30°)3

Since LHS = RHS

sin3x = 3sinx – 4 sin3x

Hence proved.

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