Answer :

We know that I

Now, LHS = I + A


=


And on RHS = (I – A)






As we know,

cos 2θ = 1 - 2 sin2 θ

cos 2θ =  2 cos2 θ - 1

and sin2θ = 2 sinθ cosθ



As tanθ = sinθ/cosθ



=


= LHS


Hence Proved.

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