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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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