Question

Find the limit of cosx
x→5π/3

Answer 1

Since a circle is 2pi, we can add or subtract by 2pi to get the same answer - 5pi/3-2pi=pi/3, and cos(pi/3)=1/2 (by memorization). Since cos(x) is a function (for every x value, there is 1 y value) with no breaks in it etc., your answer is 1/2