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If AB=O for the matrices A=[[cos^2theta,...

If `AB=O` for the matrices `A=[[cos^2theta,costhetasintheta],[costhetasintheta,sin^2theta]]` and `B=[[cos^2phi,cosphisinphi],[cosphisinphi,sin^2phi]]` then `theta-phi` is

A

an odd multiple of `(pi)/(2)`

B

an odd multiple of `pi`

C

an even multiple of `(pi)/(2)`

D

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RESONANCE ENGLISH-MATRICES & DETERMINANT-EXERCISE-2
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