The product of matrices A = [(cos^(2) th...

The product of matrices A = `[(cos^(2) theta, cos theta sin theta),(cos theta sin theta , sin^(2) theta)] and sin B = [(cos^(2)phi, cos phi sin phi),(cos phi sin phi, sin^(2) phi)]` is a null matrix if `theta - phi =`

A

`2 n pi, n in Z`

B

`n (pi)/(2), n in Z`

C

`(2n+ 1) (pi)/(2) , n in Z`

D

`n pi, n in Z`

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The correct Answer is:

C

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