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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