Multiplication by i is geometrically a counterclockwise rota

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If v^t Av <0, then the matrix rotates the vector v by more than 90

What is the matrix for the rotation, when the point p (3,-5) is

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In the complex plane, multiplying a real number by the imaginary

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matrices - How is that a rotation by an angle θ about the origin

What is the matrix for the rotation, when the point p (3,-5) is