Question

Solve:
cos(3pie/4)

Answer 1

Okay, I will show you how to solve it if you dont have a calculator at hand.

Answer 2

First, we know that the circum. of a circle is 2pi. A circle's circum is 360. so 2pi=360. So pi=180. Since we know that pi equals 180, we can plug it into the equation. First, you will multiply 180 with 3, then divide that # by 4. Finally, you plug it into the pararenthesis and solve for cos.

Answer 3

let me make a modest suggestion
you are working in numbers, not degrees, so forget degrees
find \(\frac{3\pi}{4}\) on the unit circle on the last page of the attached cheat sheet
then find the coordinates on the unit circle corresponding to that number
the first coordinate is cosine
the second coordinate is sine