求sin10sin30sin50sin70的值
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求sin10sin30sin50sin70的值求sin10sin30sin50sin70的值求sin10sin30sin50sin70的值cos10sin10sin30sin50sin70/cos10
求sin10sin30sin50sin70的值
求sin10sin30sin50sin70的值
求sin10sin30sin50sin70的值
cos10sin10sin30sin50sin70/cos10=(1/2)sin20sin30sin50cos20/cos10=(1/4)sin40sin30cos40/cos10=(1/8)sin80sin30/cos10=1/16
1/16