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Solve: |[sintheta,costheta],[sintheta,si...

Solve: `|[sintheta,costheta],[sintheta,sintheta]|=1`

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costheta[(costheta, sintheta),(-sintheta,costheta)]+sintheta[(sintheta,-costheta),(costheta,sintheta)] is equal to (A) [(0,0),(1,1)] (B) [(1,1),(0,0)] (C) [(0,1),(1,0)] (D) [(1,0),(0,1)]