If A=((cos^(2)alpha , cos alpha sin alph...

If `A=((cos^(2)alpha , cos alpha sin alpha),(cos alpha sin alpha, sin^(2)alpha))` and `B=((cos^(2)beta , cos betasin beta),(cosbeta sin beta,sin^(2)beta))` are two matrices such that the product AB is the null matrix then ` alpha - beta = `

multiple of `pi`

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

can not be determind

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