13°
87°
100°
110°
Correct answer is B
a.b=|a||b|cosθ
a=3i−4j;b=6i+4j
18−16=(√32+(−4)2)(√62+42)cosθ
2=5√52cosθ
cosθ=25√52=0.0555
\theta = 86.8° \approxeq 87°
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