我的疑问 若sin(x+y)=0.5,sin(x-y)=1/3,则tanx/tany为().
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我的疑问 若sin(x+y)=0.5,sin(x-y)=1/3,则tanx/tany为().
若sin(x+y)=0.5,sin(x-y)=1/3,则tanx/tany为().A.5 B.-1 C.6 D.1/6
若sin(x+y)=0.5,sin(x-y)=1/3,则tanx/tany为().A.5 B.-1 C.6 D.1/6
先看看你解决了没有,这道题要用整体的观念解答 从问题出发 tanx/tany 化解为 sinxcosy/sinycosx 然后看sin(x+y)=sinxcosy+sinycosx=0.5 sin(x-y)=sinxcosy-sinycosx=1/3 解方程组有sinxcosy=5/12 sinycosx=1/12 所以选A
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