作业帮sin10sin30sin50sin70 求值
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sin10sin30sin50sin70 求值
sin10sin30sin50sin70 求值
sin10sin30sin50sin70 求值
原式=sin10sin30cos40cos20然后分子分母同时乘以cos10,你按照这个方法操作一下,就知道答案了 1/16
sin10sin30sin50sin70=sin10sin30cos40cos20=2sin10cos10sin30cos40cos20/2cos10=1/2sin20cos20cos40/2cos10=1/4sin40cos40/2cos10=1/8sin80/2cos10=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