1.

The least positive integer n such that ⎛⎜⎜⎝cosπ4sinπ4−sinπ4cosπ4⎞⎟⎟⎠n is an identity matrix of order 2 is

Answer»

The least positive integer n such that
cosπ4sinπ4sinπ4cosπ4
n
is an identity matrix of order 2 is



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