Question 1151367
answer: C. {{{-y= cos(x+pi/2)}}}

{{{ drawing ( 600, 600, -10, 10, -10, 10, 
circle(pi/2,0,0.12),circle(3pi/2,0,0.12),
circle(pi,0,0.12),circle(2pi,0,0.12),
locate(pi/2,-0.5,pi/2),locate(pi,-0.5,pi),locate(3pi/2,-0.5,3pi/2),locate(2pi,-0.5,2pi),
graph( 600, 600, -10, 10, -10, 10,  -cos(x+pi/2))) }}}