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Euler's formula in mathematics. Math resources for teachers and students.
Sines, Portugal. Sines coastal town in Portugal with harbor and traditional houses along the waterfront street
Sines, Portugal. Vasco da Gama statue stands prominently near the historic Sines Castle overlooking the harbor
Wavy line abstract background. slanting, oblique geometric pattern. ripple line pattern background. abstract black curve wave lines. wave stripe background

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