prove that sin 3x=3 sin x-4 sin 3x
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Answered by
2
Answer: -
LHS↓
hence proved
_______________________
formula use:↓
Answered by
3
Step-by-step explanation:
sin3x=sin ( 2x + x )
=sin2xcosx + cos 2x sin x
=2sinx cosx cosx + ( 1 − 2 sin²x )sinx
=2sinx( 1 − sin²x ) + sinx − 2sin 3x
=3sinx − 4sin 3x
I'm good
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