sin10°×sin50°×sin70°等于多少
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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°×
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!
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