Which pair of functions has identical graphs?
(a). y=sin (x+ pi/2)
(b). y=-cos(x-pi)
(c). y=cos( x-pi/2)

c-   36

taxicab circle radius 9 has 4(9) = 36 points

step-by-step explanation:

at each of the parallel lines adjacent angles are supplementary. the angles have special names identifying their positions with respect to the parallel lines and transversal. they are corresponding angles, alternate interior angles, or alternate exterior angles. an angles is congruent to its matched angle.