איך אתה מוכיח כי sqrt (3) cos (x + pi / 6) - cos (x + pi / 3) = cos (x) -sqrt3sinx?

איך אתה מוכיח כי sqrt (3) cos (x + pi / 6) - cos (x + pi / 3) = cos (x) -sqrt3sinx?
Anonim

# LHS = sqrt3cos (x + pi / 6) -cos (x-pi / 3) #

# cccx * cosx * cosx * cinx * cinx * cinx * cinx * cinx * cinx * cinx * cinx * cinx * pin / 6)

# * sqrt3 cosx * (sqrt3 / 2) - sinx * (1/2) - cosx * (1/2) - sinx * (sqrt3 / 2) #

# = (3cosx-sqrt3sinx) / 2- (cosx-sqrt3sinx) / 2 #

# = (3cosx-sqrt3sinx-cosx + sqrt3sinx) / 2 #

# = (2cosx) / 2 = cosx = RHS #