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Number of values of 0 lying I [0,100p...

Number of values of 0 lying I [0,100`pi`] for which the system of equations (sin 30) x-y+z=0, (cos 20) x+4y +3z=0, 2x+ 7y+7z =0 has non-trivial solution is `"____"`

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The correct Answer is:
`n pi or mpi +(-1)^m(pi//6),(m,ninI)`
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