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if the vectors vecc, veca = xhati +yhatj...

if the vectors `vecc, veca = xhati +yhatj + zhatk and vecb = hatj` are such that `veca , vecc and vecb` from a right -handed system, then find `vecc`.

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Since `veca ,vecc and vecb` form a right - handed system,
`vecc = vecb xx veca`
`= hatj xx (xhati + y hatj + z hatk) `
= - x hatk + zhati = z hati - x hatk`
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