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If cos theta{:((cos theta, sin theta),(-...

If `cos theta{:((cos theta, sin theta),(-sin theta, cos theta)):}+ sin theta{:((x,-cos theta),(cos theta, x)):}=I_(2)`, find x.

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PREMIERS PUBLISHERS-ALGEBRA-SOLUTION TO UNIT EXERCISE
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  18. If cos theta{:((cos theta, sin theta),(-sin theta, cos theta)):}+ sin ...

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