where 
, then
(a) Det (A) = 0 (b)
Det (a) 
(c) Det (A) 
(d)
Det (A) 
Answer:
Det 
Expand along R1
Det (A)
= 1 (1 + sin2 
) ? sin (? sin + sin ) + 1
(sin2 +
1)
= 1 + sin2
+ sin2
+ 1
= 2 + 2 sin2
As we know that 
(D) is
true.
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