Cos(x) is a sinusoidal function with a period of 2π and amplitude 1, i.e. it oscillates between +1 and -1.
You're expected to know the basic graph of cos(x), sin(x) and tan(x).
(see link below for details).
Based on the basic graphs, we can graph the variants. From cos(x), we can graph Acos(x), where A is a numerical constant, which multiplies the amplitude A times. Thus Acos(x) has an amplitude of A.
so g(x)=4cos(x) is simply the graph of cos(x) with an amplitude of 4.
More about graphing sinusoidal functions. Be patient, page 1 is about sin(x), but examples on cos(x) is on page 2 of the link.
http://www.purplemath.com/modules/grphtrig.htm
how would i graph
g(x)=4cosx
1 answer
1 answer