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If neither alpha nor beta is a multiple ...

If neither `alpha` nor `beta` is a multiple of `pi/2` and the product AB of matrices `A=[(cos^2alpha, cosalpha sin alpha),(cosalpha sinalpha, sin^2alpha)] and B=[(cos^2beta, cosbeta sinbeta),(cosbetasinbeta, sin^2beta)]` is a null matrix then `alpha- beta` is (A) 0 (B) an odd mutiple of `pi/2` (C) a multiple of `pi` (D) none of these

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