Maths-
General
Easy
Question
and 
- 1
- -1
- 2
Hint:
We are given three vectors having magnitude 1. We are also given that two of the vectors are perpendicular. We are given the the angle between other two vector is α and the angle between the other two is β. We have to find the value of cosα + cosβ. We will use the given conditions to solve the question.
The correct answer is: -1
The given vectors are 
The given conditions are as follows:
The angle between the vectors 
is α.
The angle between the vectors 
is β.
We have to find the value of cosα + cosβ.
Let's take dot product of pair of vectors.
Now, we will use the given condition to solve further.
Substituting all the values we get,
So, the answer is -1.
For such questions, we should know about the dot product.
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