यदि A=[{:(,1-cos^(2)alpha,1-sin^(2)alpha...

यदि `A=[{:(,1-cos^(2)alpha,1-sin^(2)alpha),(,sin alpha,cos alpha):}]` तथा `B=[{:(,cos^(2)alpha,sin^(2)alpha),(,-sin alpha,-cos alpha):}]` हो तो A+B का मान होगा-

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