Trigonometry Examples

$\cos (\arctan (0.43))$

Step 1

Draw a triangle in the plane with vertices $(1, 0.43)$ , $(1, 0)$ , and the origin. Then $\arctan (0.43)$ is the angle between the positive x-axis and the ray beginning at the origin and passing through $(1, 0.43)$ . Therefore, $\cos (\arctan (0.43))$ is $0.91866918$ .

$0.91866918$