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Select and write the correct answer from the given alternatives in each of the following:If AB=0 where `A=[[cos^2theta,costhetasintheta],[costhetasintheta,sin^2theta]]`and `B=[[cos^2phi,cosphisinphi],[cosphisinphi,sin^2phi]]`,then `(theta-phi)`is equal to

A

0

B

`pi/2`

C

`pi/4`

D

`pi`

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