If xsina+ysin2a+zsin3a=sin4a, xsinb+ysi...

If `xsina+ysin2a+zsin3a=sin4a`, `xsinb+ysin2b+zsin3b=sin4b`, `xsinc+ysin2c+zsin3c=sin4c`, then the roots of the equation `t^3-(z/2)t^2-((y+2)/4)t+((z-x)/8)=0,a , b , c ,!=npi,` are (a)`sina ,sinb ,sinc` (b) `cosa ,cosb ,cosc` (c)`sin2a ,sin2b ,sin2c` (d) `cos2a ,cos2bcos2c`

A

sin a , sin b , sin c

B

cos a, cos b , cos c

C

sin 2a , sin 2b , sin 2c

D

cos 2a , cos 2b , cos 2c

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The correct Answer is:

B

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