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A vector has component A1, A2a n dA3 in ...

A vector has component `A_1, A_2a n dA_3` in a right -handed rectangular Cartesian coordinate system `O X Y Zdot` The coordinate system is rotated about the x-axis through an angel `pi//2` . Find the component of `A` in the new coordinate system in terms of `A_1, A_2, a n dA_3dot`

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