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Simplify: cos theta[{:(costheta,sinthe...

Simplify:
`cos theta[{:(costheta,sintheta),(-sintheta,costheta):}]+sintheta[{:(sin theta ,-costheta),(costheta, sintheta):}]`

A

`[(1,0),(1,0)]`

B

`[(0,0),(0,0)]`

C

`[(1,0),(0,1)]`

D

`[(0,0),(1,0)]`

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