Let lambdaa n dalpha be real. Find the s...

Let `lambdaa n dalpha` be real. Find the set of all values of `lambda` for which the system of linear equations `lambdax+(s inalpha)y+(cosalpha)z=0,x+(cosalpha)y+(s inalpha)z=0,-x+(s inalpha)y-(cosalpha)z=0.`

`(-alpha,sqrt2)uu (sqrt2,oo)`

`-1`

`(-sqrt5,-sqrt2`

none of these

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