正弦 (zhèng xián) — sine (mathematics)

定義

例文

• 在直角三角形中，正弦等于对边除以斜边。
  Zài zhí jiǎo sān jiǎo xíng zhōng, zhèng xián děng yú duì biān chú yǐ xié biān.
  In a right triangle, the sine equals the opposite side divided by the hypotenuse.
• 正弦函数的值在负一和一之间变化。
  zhèng xián Hán shù de zhí zài fù yì hé yī zhī jiān biàn huà.
  The value of the sine function varies between negative one and one.
• 正弦的图象是一条波浪线。
  zhèng xián De tú xiàng shì yì tiáo bō làng xiàn.
  The graph of sine is a wavy line.