Question

Coordinates of all points of intersection of y=cos(x) and y=sin(x)

Answer 1

sin x = cos x
divide by cos x
tanx = 1

one value of x = 45 degrees or pi/4 radians
do you know the others

Answer 2

You could also divide both sides by sin(x) to get

cot(x) = 1

Answer 3

just sayin