Yeah, C and D are the same scale. So using C and D you can multiply, using D and S (in your case) gives you the sine. There is no rule for where a scale is located. Some have S on the slide, some on the body. A few have it (and ST) on both the slide and body, so you can do trig and other arithmetic without having to reset your slide.
I picked up a Pickett 500 ES a few months ago, and its a blast to use.
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