sin10sin30sin50sin70的值

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sin10sin30sin50sin70的值sin10sin30sin50sin70的值sin10sin30sin50sin70的值sin10sin30sin50sin70=cos10sin10sin

sin10sin30sin50sin70的值
sin10sin30sin50sin70的值

sin10sin30sin50sin70的值
sin10sin30sin50sin70
=cos10sin10sin30sin50sin70/cos10
=1/2sin20sin70sin30sin50/cos10
=1/4sin40sin50sin30/cos10
=1/8sin80sin30/cos10
=1/8cos10sin30/cos10
=1/8sin30
=1/8*1/2
=1/16

SIN10约为0.1736481777
SIN30为0.5
SIN50约为0.7660444431
SIN70约为0.9396926208
乘起来是1/16

sin10sin30sin50sin70=(sin10sin30sin50sin70*cos10)/cos10
=(sin20sin30sin50sin70)/2cos10
=(sin20sin30sin50cos20)/2cos10
=(sin40sin30sin50)/4cos10
=(sin40sin30cos40)/4cos10
=(sin80sin30)/8cos10
=(sin80sin30)/8sin80
=1/16

求值：sin10sin30sin50sin70 化简sin10sin30sin50sin70 sin10sin30sin50sin70= sin10sin30sin50sin70 求值 sin10sin30sin50sin70=多少 sin10sin30sin50sin70的值 求sin10sin30sin50sin70的值 求sin10sin30sin50sin70的值 sin10sin30sin50sin70的值= (是度）答案是1/16 我要过程 求sin10sin30sin50sin70的值(最好有过程),还有的就是sin20sin60sin100sin140=cos10cos30cos50cos70吗? (1/2)求值,1.sin10sin30sin50sin70 2.(2cos10-sin20)/cos20 3.(1+cos20)/2sin20 sin10sin30sin50sin70 =1/2sin1sin10sin30sin50sin70=1/2sin10sin50sin70=1/2sin10cos20cos40=1/2cos10cos10cos20cos40/cos10=1/4sin20cos20cos40/cos10=1/8sin40cos40/cos10=1/16sin80/cos10=1/16cos10/cos10=1/16第一步到第二步sim50sin70怎么变成了cos20