sin22°cos8°+cos22°sin8°
1.sin7°+cos15°sin8°/cos7°-sin15°cos8°=
(sin7°+cos15°cos8°)/(sin7°-sin15°sin8°)的化简
关于三角函数的计算题(sin8°+sin7°cos15°)÷(cos8°-sin7°sin15°)=?
求(sin8°+sin7°cos15°)/(cos8°-sin7°sin15°)的值
化简(cos⁴7°30′-sin⁴7°30′)(sin23°cos8°-sin67°sin8°)
化简COS8°-SIN17°SIN9°/COS9°
计算:sin21°+sin22°+sin23°+…+sin287°+sin288°+sin289°.
sin8*cos8判断此三角函数值得符号
sin22度30分*cos22度30分=?
计算:sin21°+sin22°+sin23°+…+sin288°+sin289°+sin290°= ___ .
化简:cos21°+cos22°+cos23°+…+cos289°.
2根号下(1+sin8)-根号下(2cos8+2)