6. Consider the following functions, which are NOT one-to-one on their domains. Identify an interval where the function IS one-to-one (draw a box enclosing the curve), making its inverse defined. a) y = sin(x) sin (x) is defined on YA y = sin x it O b) y = cos(x) cos (x) is defined on 3 TC y = cos x 2 O 37 X 2 c y = tan(x) tan (x) is defined on