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|dw:1443488320174:dw|So we've got our low and our high point.

So the amplitude is 7.5-.5/2 which is 3.5?

Where is the middle of our function going to be located?

Not sure?

|dw:1443488549410:dw|

3.75?

3.5 + 0.5
Hmm that doesn't sound right :d

Ohhhh oops I see now, 4

Beautiful!

This is where I always have a problem. How exactly do you decide whether to use sine or cosine?

|dw:1443488906789:dw|

Does sine always cross at (0,0)?

|dw:1443489123175:dw|So which one seems more appropriate? :)

cosine!

Cosine, ok good.

Ok! Is the period 2pi/5 or did I do that incorrectly?

Oh ok that makes so much sense

yep that's what I meant, great!

How do we find D?

normally that middle line is the x-axis.
But now it's up at 4, ya?

yep

so is 4 d?

yay team \c:/

YAY! Thanks so much, you're the bomb!!