# How do you know how to solve sec 45?

##### 2 Answers

#### Explanation:

we have an isosceles right triangle

where the ratio of its sides are

Cosine = adjacent/hypotenuse

1/cosine=hypotenuse/adjacent

thus:

#### Explanation:

We know that

On the unit circle, the coordinates for

This means

Which also means that

which simplifies to

The convention is to not have an irrational number in the denominator, so we can multiply the top and bottom by

Hope this helps!