单语范例（未经PONS编辑处理）
The law of cosines can be used to determine a side of a triangle if two sides and the angle between them are known.
en.wikipedia.org Jy and koti-jy are closely related to the modern trigonometric functions of sine and cosine.
en.wikipedia.org Previously it was necessary to consult sine/cosine tables, a time-consuming process.
en.wikipedia.org This means that 1/7.0 is the cosine of 81.8 degrees, and so we can multiply 0.35 by 1/7.0 using the above procedure.
en.wikipedia.org On some processors, the cosine and sine of the same argument can be calculated in parallel using a single instruction.
en.wikipedia.org