Calculate the amplitude of the periodic function y=7cos(3x) .

Question

A) 3

B) 7

C) 14

D) -3

Answer 1

The general form for a cosine function is:

y = a·cos(b(x-c)) + d

where:

1. a = amplitude
2. b = 2π/period
3. c = phase (horizontal) shift
4. d = vertical shift

Can you figure it out?