Help Graphing Sine Function
1. The problem statement, all variables and given/known data
I have to graph this function without a calculator, and I'm not sure how to scale the x axis. y = 2  sin(3x  ∏/5) 2. Relevant equations y = Asin(Bx + C) Period = 2∏/B Phase Shift = C/B 3. The attempt at a solution I know that the graph will be reflected across the x axis Amplitude: 1 Period: 2∏/3 Period divided by four = ∏/6 Phase Shift: (∏/5)/3 = ∏/15 My professor had told us to graph with a phase shift, you add the period/4 four times like this: ∏/15 + ∏/6 = 7∏/30 7∏/30 + ∏/6 = 12∏/30 or 2∏/5 12∏/30 + ∏/6 = 17∏/30 17∏/30 + ∏/6 = 21∏/30 or 11∏/15 I'm supposed to start the graph at the phase shift, ∏/15, but I don't know how to scale the rest of the xaxis. How do I get to 7∏/30 on the numberline from ∏/15? Gosh I feel so dumb ): 
Re: Help Graphing Sine Function
Ohhhhhhhhhhhhhhhhhhhhhhhhhh, I scale it by ∏/30 don't I? Cue facepalm.

Re: Help Graphing Sine Function
No, you don't. [itex]3x \pi/5= 3(x \pi/15)[/itex].

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