1.

If alphaandbeta are not the multiple of (pi)/(2)and [{:(cos^(2)alpha,cosalphasinalpha),(cosalphasinalpha,sin^(2)alpha):}]xx[{:(cos^(2)beta,sinbetacosbeta),(sinbetacosbeta,sin^(2)beta):}]=[{:(0,0),(0,0):}]then alpha-beta is ......

Answer»

any MULTIPLE of `PI`
odd multiple of `(pi)/(2)`
0
odd multiple of `pi`

ANSWER :B


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