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The product of matrices A=[[cos^2theta,s...

The product of matrices `A=[[cos^2theta,sinthetacostheta],[sinthetacostheta,sin^2theta]]` and `B=[[cos^2phi,sinphicosphi],[sinphicosphi,sin^2phi]]` is a null matrix if `theta-phi=` (A) `2npi,n in Z` (B) `(npi)/2, n in Z` (C) `(2n+1)pi/2, n in Z` (D) `npi, n in Z`

A

`C((2pi)/(5),-(11pi)/(10))`

B

`C((11pi)/(10),-(2pi)/(5))`

C

`C((3pi)/(7),-(41pi)/(14))`

D

`C((7pi)/(3),-(29pi)/(6))`

Text Solution

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The correct Answer is:
A, B, C, D
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