Question

Write the equation of the cosine function with amplitude 2 period 4p

Answer 1

Amplitude* cos(2pi/period)

Answer 2

period of \[cos(bx)\] is \[\frac{2\pi}{b}\]
here you want period of \[4\pi\] so set \[\frac{2\pi}{b}=4\pi\] and solve for \[b\]
to get \[b=\frac{1}{2}\]

Answer 3

so your function will be \[2cos(\frac{x}{2})\]

Answer 4

much faster this afternoon yes?

Answer 5

"Write the equation of the cosine function with amplitude 2; period 4p"

This depends on what exactly they mean by 4p, maybe (4pi?) but:

2 cos(x/2)

Answer 6

little but, they must have replaced the Dcells in the ti-83 lol