Question

Fill in the following table for f(x) = cos(x)

Answer 1

you just plug the numbers into x and solve, if you having issues with radians then convert to degrees for clarification.

Answer 2

You want to find the angle on the unit circle, then you want to find the horizontal length of the triangle.

Answer 3

The circle is radius 1, so the hypotenuse will always be 1.

Answer 4

Fortunately, all those angles make it easy to calculate cos(x).

Answer 5

@coolaidd get it?