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Q.

If cosx+2cosy+3cosz=sinx+2siny+3sinz=0 then the value of sin3x+8sin3y+27sin3z is

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a

sin(x+y+z)

b

3sin(x+y+z)

c

18sin(x+y+z)

d

sin(x+2y+z)

answer is C.

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Detailed Solution

α=cisx,β=cisy,γ=cisz Given 

cosx+2cosy+3cosz=sinx+2siny+3sinz=0

α+2β+3γ=(cosx+2cosy+3cosz)+i(sinx+2siny+3sinz)=0

α+2β+3γ=0α3+8β3+27γ3=18αβγ

cis3x+8cis3y+27cis3z=18cis(x+y+z)

sin3x+8sin3y+27sin3z=18sin(x+y+z)

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