(sin3x+sinx)sinx+(cos3x-cosx)cosx=0
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( sin3x + sinx )sinx + (cos3x - cosx)cosx=0 prove it
Ask for details Follow Report by Abubakkar 06.08.2018
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MarkAsBrainliest
MarkAsBrainliest Genius
Answer :
Now,
(sin3x + sinx) sinx + (cos3x - cosx) cosx
= sin3x sinx + sin²x + cos3x cosx - cos²x
= (cos3x cosx + sin3x sinx) - (cos²x - sin²x)
= cos(3x - x) - cos2x
= cos2x - cos2x
= 0
Hence, proved.
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