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Autor:Kyeongsik Choi, Alex CHIK, Anthony OR 柯志明

Temat:Trygonometria

녹색 점을 드래그하면 길이와 각도가 변경됩니다.

Adapted from Alex Chik's applet in gMath 互動數學教室 http://www.geogebra.hk.

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