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Find the inverse of the matrix `[[cos theta,-sintheta],[sintheta,costheta]]`

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We know that the inverse of the `2 xx2` matrix is the interchange of diagonal off elements and their sign.
thus `A^(-1)=[[cos theta,sintheta],[-sintheta,costheta]]`
as A= `[[cos theta,-sintheta],[sintheta,costheta]]`
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