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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+(sinalpha)y+(cosalpha)z=0,x+(cosalpha)y+(sinalpha)z=0,-x+(sinalpha)y-(cosalpha)z=0.` have trivial solution

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