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NDA Math Vector Algebra

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Consider the following for the next two (02) items that follow:
Let

→

a

,

→

b

and

→

c

be three vectors such that

→

a

++

→

b

+

→

c

=0 and |

→

a

|=10,|

→

b

|=6 and |

→

c

|=14

[NDA II 2016]

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Question : 64 of 101

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What is the angle between

30°
45°
60°
75°

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