Find the matrix that corresponds to rotating about the origin by an angle of $120^\circ$ counter-clockwise.
Question:
Find the matrix that corresponds to rotating about the origin by an angle of $120^\circ$ counter-clockwise.
Answer:
Let's think step by step.

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\begin{pmatrix} -1/2 & -\sqrt{3}/2 \\ \sqrt{3}/2 & -1/2 \end{pmatrix}
Find the matrix that corresponds to rotating about the origin by an angle of $120^\circ$ counter-clockwise.
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