Question

f(x)=cos(2x-pi/5)+1
f(x)intersect the x-axis at the following points
x=...-7/5pi,-2pi/5,3pi/5,8pi/5,...,1/5pi(5k-2)
for any integers k
what is the closest intersection point (x,y) to the origin (0,0)?

Answer 1

What is lower: 2pi/5 or 3pi/5?

Answer 2

-2pi/5

Answer 3

what mean is 1/5pi(5k-2)?

Answer 4

Put any integer k in this solution and get the intersection point.