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Amplitude of sinusoidal functions from equation


What is the amplitude of g, left parenthesis, x, right parenthesis, equals, minus, 9, cosine, left parenthesis, start fraction, pi, divided by, 2, end fraction, x, minus, 6, right parenthesis, plus, 8?
  • Your answer should be
  • an integer, like 6
  • an exact decimal, like 0, point, 75
  • 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