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Vasco da Gama beach in Sines, Alentejo, Portugal in Europe.
An old sine bar made from hardened steel and finely ground used by toolmakers and engineers of yesteryear to set and measure angles with great precision.
Wooden walkway by Espingardeiro Beach, Vicentina Route, Alentejo, Portugal
The sinusoidal waveform of electric signal displays on the oscilloscope monitor.
Graph of sine and cosine functions

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