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Simplify using matrix operations
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Question: Simplify costheta[[costheta, sintheta],[-sintheta,cos theta]]+sintheta[[sintheta, -costheta],[costheta, sintheta]]
Question: Simplify costheta[[costheta, sintheta],[-sintheta,cos theta]]+sintheta[[sintheta, -costheta],[costheta, sintheta]]
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