If A=[0 -tan(alpha)/2]

tan(alpha)/2 0 ] and I is an identity matrix of order 2, then (I-A)[ cos(alpha) -sin(alpha)

sin(alpha) cos(alpha)]

is equal to?

(A)A

(B)I

(C)I+A

(D)none of the above

We prove that, I+A=I-Acosα-sinαsinαcosα
 



Hence, the correct option is C.

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