If `veca=5hati-hatj+7hatk and vecb=hati-hatj+lamda hatk, find lamda ` such that `veca+vecb

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If `veca=5hati-hatj+7hatk and vecb=hati-hatj+lamda hatk, find lamda ` such that `veca+vecb and veca-vecb` are orthogonal
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