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If |hata+hatb|=|hata-hatb|, then find th...

If `|hata+hatb|=|hata-hatb|`, then find the angle between `veca and vecb`

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Let angle between `veca and vecb` be `theta" "because |hata+hatb|=|hata-hatb|" "therefore sqrt(1^(2) + 1^(2) + 2(1)(1) cos theta )= sqrt (1^(2) + 1^(2) - 2(1)(1) cos theta )`
`rArr" "2+2 cos theta = 2-2 cos theta rArr cos theta =0 therefore theta = 90^(@)`
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