Q2: If , then for what value of a is A an identity matrix?

Question

Q2: If  , then for what value of a is A an identity matrix?

David · Accepted Answer

Solution 2: Given that  
      A=
cos sin
sin cos
 
 
 
 
 
.If A is identity matrix i.e.  
cos sin
sin cos
 
 
 
 
 
=
1 0
0 1
 
 
 
 this gives 2 ,n  n= 0, 1, 2,  

Q2: If , then for what value of a is A an identity matrix?

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