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यदि veca=2hati-3hatj+6hatk, vecb=2hati+h...

यदि `veca=2hati-3hatj+6hatk, vecb=2hati+hatj-4hatk` हो, तो सिद्ध कीजिए कि
`(veca+vecb).(veca-vecb)=|veca|^(2)-|vecb|^(2)`.

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