sin10°×sin50°×sin70°等于多少
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/08 07:42:03
sin10°×sin50°×sin70°等于多少
![sin10°×sin50°×sin70°等于多少](/uploads/image/z/4367445-69-5.jpg?t=sin10%C2%B0%C3%97sin50%C2%B0%C3%97sin70%C2%B0%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91)
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
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
sin10°×sin50°×sin70°等于多少
sin10°*sin50°*sin70°等于好多
sin10°sin50°-sin50°sin70°-sin70°sin10°=?
sin10°sin30°sin50°sin70°=?
求值:sin10°sin50°sin70°sin80°
求值:sin10°sin50°·sin70°
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正弦函数求值sin10°*sin50°*sin70°
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sin10°×sin30°×sin50°×sin70°=( ).求详解,
sin10°sin30°sin50°sin70°的值为( )
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