sin10°cos45°+sin80°cos55°
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/17 16:32:52
sin10°cos45°+sin80°cos55°
![sin10°cos45°+sin80°cos55°](/uploads/image/z/17479314-18-4.jpg?t=sin10%C2%B0cos45%C2%B0%2Bsin80%C2%B0cos55%C2%B0)
原式=sin10°cos45°+sin(90°-10°)cos(90°-45°)
=sin10°cos45°-sin10°cos45°
=0
题目中的cos55°应该是cos45°吧?
=sin10°cos45°-sin10°cos45°
=0
题目中的cos55°应该是cos45°吧?
1/sin10°-根号3/sin80°
1/sin10°-√3/sin80°
求值:sin10°sin50°sin70°sin80°
1/sin10°— √3/sin80°
求值:1/sin10°-根号3/sin80°
不查表,计算1/sin10°-(根号3)/sin80°=
1/sin10°-根号3/sin80°的值为
求值:1/sin10°-√3/sin80°
1/sin10°-根号3/sin80°=
求值[2sin50°+sin10°(1+√3tan10°)]*√2(sin80°)*(sin80°)
[2sin50°+sin10°(1+√3tan10°)]*√2(sin80°)*(sin80度)
求[2sin50°+sin10°(1+√3tan10°0]sin80°的值