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Problem

Below is the graph of a trigonometric function. It has a maximum point at left parenthesis, minus, start fraction, 5, pi, divided by, 4, end fraction, comma, 6, point, 7, right parenthesis and an amplitude of 4, point, 1.
What is the midline equation of the function?
y, equals
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4
  • an exact decimal, like 0, point, 75
  • a multiple of pi, like 12, space, p, i or 2, slash, 3, space, p, i