Why is cos -pi/6 the same as cos pi/6?
1 Answer
May 15, 2015
The cosine function is even, which means that
In opposition, the sine function is odd, which means that
You can observe that on the trigonometric circle :
(source : http://en.wikipedia.org/wiki/Unit_circle)
You see that when you have an angle of
In opposition, the ordinate (the