Definition

Examples

• 在直角三角形中，正弦等于对边除以斜边。
  Zài zhíjiǎo sānjiǎoxíng zhōng, zhèng xián děngyú duìbiān chúyǐ xiébiān.
  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 hánshù de zhí zài fù yī hé yī zhījiān biànhuà.
  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 túxiàng shì yì tiáo bōlàng xiàn.
  The graph of sine is a wavy line.