Half-Wave Design: Find Sine Function y=asin(b(x-c))+d

[temaire]

Homework Statement

The half-wave design may be represented as a portion of a sine function. Determine a sine function that models the half wave design, assuming that the origin is at the point (0,0). Express in the form $$y=asin(b(x-c))+d$$

http://img231.imageshack.us/img231/3549/archpc5.jpg​

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Homework Equations

$$y=asin(b(x-c))+d$$

The Attempt at a Solution

My answer is $$y=4sin(\frac{\pi}{10}(x+5))+7$$

Am I right? I was just confused when the question said to represent it as a portion of a sine function.

 

[konthelion]

The function is fine, you just need to define a domain for the half-wave design.

 

[temaire]

Thanks. I forgot to write it down, but the question already provides the domain of x between -5 and 5.