正せい弦げんせいげんFreq.FrequencyTop 100,000Meanings1nounsinemathematicsMathematical term for the trigonometric function sine. Used in geometry, calculus, and physics.正せい弦げん関かん数すうは、直ちょっ角かく三さん角かく形けいの対たい辺へんと斜しゃ辺へんの比ひで定てい義ぎされる。The sine function is defined as the ratio of the opposite side to the hypotenuse in a right triangle.このグラフは正せい弦げん曲