### Bob on Periodic Functions

On this chapter. we worked with formulas to solve problems. the main formulas that we have to know is DABC. which Y=AsinB(X-C)+D. the problems where easy to at the beginning as we only had to change degrees in radians, and vise versa. but when we get to solving real problems using DABC. things where little hard. but hope the test won't be that hard. thats all folks.

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