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Simple Harmonic Motion
Sine and Cosine Functions
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As shown below, the sine and cosine functions display periodic motion. This means that the function repeats in the exact same way over time.
 
Look closely at the two functions... how do they compare?

sine_cosine_graph.jpg
www.mathdaily.com/lessons/Trigonometric_function

sf.jpg

If you're ready for it... Jump to kinematics!

Alesa Rabson & Maria Forero - Simple Harmonic Motion