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Homework Statement
let A be the matrix corresponding to the linear transformation from R^3 to R^3 that is rotation of 90 degrees about the x-axis
Homework Equations
find the matrix A
The Attempt at a Solution
I got stuck on rotating z component.
I tried T([e1,e2,e3])=[0 -1 0]
[1 0 0]
[0 0 -1]
I am sure this is not right
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