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NDA Math Vector Algebra

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Question : 1 of 101
 
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Let
→
a
 and
→
b
 are two unit vectors such that
→
a
+2
→
b
 and 5
→
a
−4
→
b
 are perpendicular. What is the angle between
→
a
 and
→
b
 ?
[NDA II 2022]
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