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If veca= 3hati+hatj+9hatk" and "vecb=hat...

If `veca= 3hati+hatj+9hatk" and "vecb=hati+lambdahatj+3hatk` then the value of `lambda` for which the vector `(veca+vecb)" and "(veca-vecb)` are perpendicular to each other.

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The correct Answer is:
`pmsqrt(19)`
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