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[" 14.If "A=[[cos alpha,-sin alpha],[sin...

[" 14.If "A=[[cos alpha,-sin alpha],[sin alpha,cos alpha]]" ,then "A+A'=I" If the value of "alpha" is : "],[[" (a) "(pi)/(6)," (b) "(pi)/(3)," (c) "pi," (d) "(3 pi)/(2)]]

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