11th class students
plzzz prove this
see in image
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Hey mate, here is your 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.
Trigonometric Identities :
cos(A - B) = cosA cosB + sinA sinB
cos2A = cos²A - sin²A
Hope it helps...
PLZ MARK AS BRAINLIEST!!!
eramneelofer:
Plz mark as Brainliest.
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