Irregular sin curve.

Oct 2019
7
1
France
Hi
I'm a beginner and I would like to obtain an equation to generate an irregular sin curve.
Please find the image attached.

Also, can someone suggest me some good books to start with? I would be interested to draw a curve with equations.
 

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Oct 2019
7
1
France
It looks like sin(x)-c.
Thank you for your response.
If I use Sin(x)-c then I wouldn't have control over the amplitude c&d. In this case I have two different wavelengths and two different amplitude. How do I generate an equation for it..
 
Jun 2019
445
237
USA
In your picture, you have $a=b=\pi$. Is that not what you intended? Or are you plotting $x(\theta)$ and $y(\theta)$?