AP and TS EAMCET Engineering Model Paper 18

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Question : 66 of 160

Marks: +1, -0

If l,m,n are the direction cosines of a line and A=[

l2	lm	ln
lm	m2	mn
ln	mn	n2

] Then A is

Involutory matrix
Nilpotent matrix
Idempotent matrix
orthogonal matrix

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