计算:sin21°+sin22°+sin23°+…+sin287°+sin288°+sin289°.
计算:sin21°+sin22°+sin23°+…+sin287°+sin288°+sin289°.
计算:sin21°+sin22°+sin23°+…+sin288°+sin289°+sin290°= ___ .
sin23°怎么用mathematic计算,
sin23°cos68°-cos23°sin68°的值
sin23°5`+cos66°55`等于多少
用计算器计算下列各式的值 sin23.5°+cos66.5° sin14.2°-tan42.6°
1.比大小:tan21°和tan31°;2.sin21°和cos21°;3.cos21°和cos22°
简单数学问题两题sin23°cos37°+sin67°cos53°=sin23°cos37°+cos23°cos53°=
数学卷五一(2):sin23°×cos37°+cos23°×sin37°=( ).求详解,
三角函数的转换cos23°cos68°+sin23°sin68°=cos(23°-68°)有这个公式吗,是怎么来的,
化简(cos⁴7°30′-sin⁴7°30′)(sin23°cos8°-sin67°sin8°)
(sin22度+cos45度*sin23度)/cos22度-sin45度*sin23度,化简