# Trigonometry

**trigonometrictrigonometricaltrigonometricallytriangle identitiestrigonometristtrigonometric functionsplanar trigonometrytrigtrigonometric stationHistory of trigonometry**

Trigonometry (from Greek trigōnon, "triangle" and metron, "measure" ) is a branch of mathematics that studies relationships involving lengths and angles of triangles.wikipedia

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