sin10°*sin50°*sin70°等于好多
来源:学生作业帮 编辑:大师作文网作业帮 分类:数学作业 时间:2024/09/22 09:57:24
sin10°*sin50°*sin70°等于好多
sin10°×sin50°×sin70°
= sin10°×sin50°×sin70°× cos10°/cos10°
= sin10°× cos10°×sin50°×sin70°/cos10°
= (1/2) × sin20°× sin50°× sin70°/cos10°
= (1/2) × sin20°× sin50°× cos20°/cos10°
= (1/4) × sin40°× sin50°/cos10°
= (1/4) × sin40°× cos40°/cos10°
= (1/8) × sin80°/cos10°
= (1/8) × sin80°/sin80°
= 1/8
【又
sin10°×sin50°×sin70°
=sin10°cos10°×cos20°×cos40°/cos10°
=.
再问: = (1/2) × sin20°× sin50°× sin70°/cos10°
= (1/2) × sin20°× sin50°× cos20°/cos10°
= (1/4) × sin40°× sin50°/cos10°
= (1/4) × sin40°× cos40°/cos10°
= (1/8) × sin80°/cos10°
= (1/8) × sin80°/sin80°
= 1/8为什么
再答: sin10°×sin50°×sin70°
=sin10°cos10°×cos20°×cos40°/cos10°
=1/2 sin20°×cos20°×cos40°/cos10°
=1/4 sin40°×cos40°/cos10°
=1/8 sin80°/cos10°
=1/8
= sin10°×sin50°×sin70°× cos10°/cos10°
= sin10°× cos10°×sin50°×sin70°/cos10°
= (1/2) × sin20°× sin50°× sin70°/cos10°
= (1/2) × sin20°× sin50°× cos20°/cos10°
= (1/4) × sin40°× sin50°/cos10°
= (1/4) × sin40°× cos40°/cos10°
= (1/8) × sin80°/cos10°
= (1/8) × sin80°/sin80°
= 1/8
【又
sin10°×sin50°×sin70°
=sin10°cos10°×cos20°×cos40°/cos10°
=.
再问: = (1/2) × sin20°× sin50°× sin70°/cos10°
= (1/2) × sin20°× sin50°× cos20°/cos10°
= (1/4) × sin40°× sin50°/cos10°
= (1/4) × sin40°× cos40°/cos10°
= (1/8) × sin80°/cos10°
= (1/8) × sin80°/sin80°
= 1/8为什么
再答: sin10°×sin50°×sin70°
=sin10°cos10°×cos20°×cos40°/cos10°
=1/2 sin20°×cos20°×cos40°/cos10°
=1/4 sin40°×cos40°/cos10°
=1/8 sin80°/cos10°
=1/8
sin10°*sin50°*sin70°等于好多
sin10°×sin50°×sin70°等于多少
sin10°sin50°-sin50°sin70°-sin70°sin10°=?
sin10°sin30°sin50°sin70°=?
求值:sin10°sin50°sin70°sin80°
求值:sin10°sin50°·sin70°
sin10°sin50°sin70° 怎样化简求值?
正弦函数求值sin10°*sin50°*sin70°
sin10°×sin30°×sin50°×sin70°=( ).求详解,
sin10°sin30°sin50°sin70°的值为( )
sin70°cos20°-sin10°sin50°的值是多少?,麻烦给出过程
求证Sin10° *Sin30° *Sin50° *Sin70° =1/16