19. If A =
3
1 2 2
2 1 -2 is an orthogonal matrix, then
2 b
a 2
(a) a = -2, b=-1
(c) a=2,b=-1
(b) a = 2, b= 1
(d) a = -2, b= 1
Answers
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Answer:
(d) a=-2, b=1
Explanation:
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