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OpenStudy (anonymous):
rotation 90 degrees counterclockwise about the origin
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OpenStudy (rsadhvika):
\[\large \left(\begin{matrix}x'\\y'\end{matrix}\right) = \left[\begin{matrix}0&-1\\1&0\end{matrix}\right]\left(\begin{matrix}x\\y\end{matrix}\right)\]
OpenStudy (rsadhvika):
\(\large (x, ~y)\leadsto (-y, ~x)\)
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