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KCET 2009 Math Solved Paper

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Question : 7

Total: 61

If ${a}↖{→} ⋅ {b}↖{→}=-|{a}↖{→}||
{b}↖{→}|,thentheanglebetween{a}↖{→}and{b}↖{→}$ is

60∘
45∘
180∘
90∘

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