Question

The value of cos X is
40/41
42/41
9/41
35/41

Answer 1

Answer:

I think we're probably talking about a right triangle. So just find the adjacent side and the hypotenuse.

Step-by-step explanation:

Once we are considering $x \in \mathbb{R}$, the range of  $\text{cos}(x)$ is $[1, -1]$. Therefore, $\frac{42}{41}$ is not true.

In this exercise, we may have

$\text{cos}(x)=\frac{x}{r} =\frac{x}{\sqrt{x^2 +y^2} }$

Considering the trigonometric functions beyond the unit circle.

Or considering the definition in the right triangle:

$\text{cos}(x)=\frac{\text{adjacent}}{\text{hypotenuse}}$