Let d_n be the determinant of the n×n
matrix whose entries, from left to right
and then from top to bottom, are
cos 1, cos 2, ..., cos n^2 . (For example,
d_3 = determinant (((cos 1 cos 2 cos 3)),((cos 4 cos 5 cos 6)),((cos 7 cos 8 cos 9))).
The argument of cos is always in radians
not degrees.)
Evalue lim_(n→∞) d_(n.)
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