vec A isa vector with direction cosines ...

` vec A` isa vector with direction cosines `cosalpha,cosbetaa n dcosgammadot` Assuming the `y-z` plane as a mirror, the directin cosines of the reflected image of ` vec A` in the plane are a. `cosalpha,cosbeta,cosgamma` b. `cosalpha,-cosbeta,cosgamma` c. `-cosalpha,cosbeta,cosgamma` d. `-cosalpha,-cosbeta,-cosgamma`

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