Help a math noob!

[Keko0]

I have a math evaluation in two days and this is getting me nuts T_T

Explain what this means:

f(x) = A Cos [B ( X - C ) ] + D

g(x) = A Sin [B ( X - C ) ] +D

I know there are 2 others just that they are negative.

for example:

If it starts at its maximum value, g = cos.

If it starts at its minimum value, g = -cos.

If it starts at its baseline value and goes up, g = sin.

If it starts at its baseline value and goes down, g = -sin.

Now i know that A is the amplitude which you can find it : Max-Min / 2

To find the horizontal axis or baseline is also easy : Max+Min / 2

Now the rest is something i dont understand.. wtf is B, C, and D?

I'll appreciate any help XD
8)

[Maguspk]

Phase Shift!

[aurik]

B modifies the frequency.
C shifts the phase.
D changes the baseline.

Get a graphing calculator and fiddle around with the equation to see exactly what they all do.