A student attaches one end of a rope to a wall at a fixed point 3 feet above the ground, as shown in the
accompanying diagram, and moves the other end of
the rope up and down, producing a wave described by
the equation y = a sin bx + c. The range of the rope's
height above the ground is between 1 and 5 feet. The
period of the wave is 411 . Write the equation that
represents this way