作业帮求值：sin10°sin50°sin70°sin80°
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/14 23:22:30
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求值：sin10°sin50°sin70°sin80°
求值：sin10°sin50°sin70°sin80°
求值：sin10°sin50°sin70°sin80°
题目错了吧sin80应该是sin30
sin10sin30sin50sin70
=cos10sin10sin30sin50sin70/cos10
=1/2sin20sin70sin30sin50/cos10
=1/4sin40sin50sin30/cos10
=1/8sin80sin30/cos10
=1/8cos10sin30/cos10
=1/8sin30
=1/8*1/2
=1/16
求值sin10°sin30°sin50°sin70°
求值：sin10°sin50°sin70°sin80°
求值：sin10°sin50°·sin70°
sin10°sin50°sin70° 怎样化简求值?
求值 sin10度sin50度sin70度
求值sin10度+sin50度-sin70度
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?
化简：sin10°sin50°sin60°sin70°
sin10°×sin50°×sin70°等于多少
sin10°*sin50°*sin70°等于好多
4×sin10°×sin50°×sin70°怎么化简
sin10°sin50°-sin50°sin70°-sin70°sin10°=?请给出过程,谢谢了谢谢!
sin10+sin50-sin70
求值sin70°cos50°+sin20°sin50°=?