KEAM 2021 Math Solved Paper

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Question : 28 of 120

Marks: +1, -0

If α is the angle made by the vector

→

a

=5

^

i

+3

^

j

+4

^

k

with the positive x-axis, then cos‌α=

5
12
1
2
√5
5
√2
10
√2
2

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