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If a and b are two vectos such that a.b lt 0 and |a.b|=|axxb|, then the angle between a and b is |
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Answer» `(3pi)/(4)` ` RARR |a||b||cos THETA|=|a||b||SIN theta|` [ where,`theta`is the angle between a and b] `rArr |cos theta| = |sin theta| ` `rArrtheta = (pi)/(4) or (3pi)/(4) "" [ "as " 0 le theta le pi ]` But`a*b lt 0 ` `therefore theta=(3pi)/(4) ` |
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