求值：sin10°sin50°sin70°sin80°

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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sin30s

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°=?