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If vector vec x satisfying vec x xx ve...

If vector ` vec x` satisfying ` vec x xx vec a+( vec x . vec b) vec c= vec d` is given ` vec x=lambda vec a+ vec axx( vec axx( vec d xx vec c))/(( vec a . vec c)| vec a|^2)` , then find the value of `lambdadot`

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`vecx xxveca=(vecx.vecb)vecc=vecd`
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