作业帮sin10°×sin50°×sin70°等于多少
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/28 17:23:00
x)+348t 02|YO7LI*'R~
)>h{vzW鄞gӷ=9
C[U)x: }dt107T j JAu(-`UhShA4Jem @q ^
sin10°×sin50°×sin70°等于多少
sin10°×sin50°×sin70°等于多少
sin10°×sin50°×sin70°等于多少
分子 分母 同时乘以 cos10°
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
求值sin10°sin30°sin50°sin70°
sin10°sin30°sin50°sin70°=?
sin10°sin30°sin50°sin70°=?
sin10°*sin30°*sin50°*sin70° 怎么做?
sin10°sin30°sin50°sin70°=?
sin10°*sin30°*sin50°*sin70°等于多少?
求值：sin10°sin50°sin70°sin80°
化简：sin10°sin50°sin60°sin70°
sin10°×sin50°×sin70°等于多少
sin10°*sin50°*sin70°等于好多
求值：sin10°sin50°·sin70°
sin10°sin50°sin70° 怎样化简求值?
4×sin10°×sin50°×sin70°怎么化简
sin10°sin50°-sin50°sin70°-sin70°sin10°=?请给出过程,谢谢了谢谢!
求cos20°cos40°cos80°sin10°sin50°sin70°
高一数学题：sin10°sin30°sin50°sin70°=?
试比较sin10°,sin50°,sin30°,sin70°的大小
sin70°cos20°-sin10°sin50°的值是多少?,麻烦给出过程