[" 13.If "Delta=|[cos alpha,-sin alpha,1...

[" 13.If "Delta=|[cos alpha,-sin alpha,1],[sin alpha,cos alpha,1],[cos(alpha+beta),-sin(alpha+beta),1]|," then "],[[" (a) "Delta in[1-sqrt(2),1+sqrt(2)]," (b) "Delta in[-1,1]," (c) "Delta in[-sqrt(2),sqrt(2)]," (d) none of these "]]

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