Question

Can someone explain linear transformations which rotates vectors by certain degrees? Examples: R^3--> R^3: A linear...

Can someone explain linear transformations which rotates vectors by certain degrees?
Examples:
R^3--> R^3: A linear transformation which rotates vectors 90 degrees about the x axis/y axis/z-axis (how would the matrix look if about a different axis)
what if it rotates 180 degrees?
R^2-->R^2?

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