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The sine function is a mathematical function that relates an angle in a right triangle to the ratio of the length of the opposite side to the length of the hypotenuse. This function is periodic, oscillating between -1 and 1, and is fundamental in various applications, particularly in representing periodic phenomena like sound waves and alternating currents. In the context of Fourier series, sine functions play a crucial role in decomposing periodic functions into their constituent frequencies.
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