AP Precalculuseasymcq1 pt
The rotation matrix for 90° counterclockwise is
A.[[0, −1], [1, 0]]
B.[[1, 0], [0, 1]]
C.[[−1, 0], [0, −1]]
D.[[0, 1], [1, 0]]
Explanation
Core Concept
It maps ⟨x, y⟩ to ⟨−y, x⟩.
Correct Answer
A[[0, −1], [1, 0]]
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