1.

The set of real values of alpha for which the system of linear equations x+ (sinalpha)y+(cosalpha)z=0 x+ (cos alpha)y + (sin alpha)z =0 -x+ (sinalpha)y-(cosalpha)z=0 has a non-trivial solution is

Answer»

`(NPI)/(2)+(-1)^(n) (pi)/(4)+ (pi)/(8)` (n is an integer)
`(npi)/(2)+ (-1)^(n) (pi)/(8)` (n is an integer)
`(npi)/(2)+ (-1)^(n)(pi)/(8)-(pi)/(8)` (NIS an integer)
`(npi)/(2)+ (-1)^(n) (pi)/(4)- (pi)/(8)` (n is an integer)

Answer :C


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