UPSC NDA I 2014 Mathematics Paper
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For the next three (03) items that follow:
The vertices of a triangle ABC are A(2, 3, 1), B(-2, 2, 0) and C(0, 1, -1).
The vertices of a triangle ABC are A(2, 3, 1), B(-2, 2, 0) and C(0, 1, -1).
[NDA I 2014]
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Question : 66 of 120
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What is the cosine of angle ABC ?
[NDA I 2014]
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