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If |veca+vecb|=|veca-vecb|, then the vec...

If `|veca+vecb|=|veca-vecb|`, then the vectors `vecaandvecb` are orthogonal

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Since, `|veca+vecb|=|veca-vecb|`
`implies|veca+vecb|^(2)=|veca-vecb|^(2)`
`implies2|veca||vecb|=-2|veca|vecb|`
`implies4|veca||vecb|=0`
`implies|veca||vecb|=0`
Hence, `vecaandvecb` are orthogonal. `[:'veca.vecb=|veca|.|vecb|cos90^(@)=0]`
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