化简tan(x+π/4)+tan(x+π/4)
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化简tan(x+π/4)+tan(x+π/4)化简tan(x+π/4)+tan(x+π/4)化简tan(x+π/4)+tan(x+π/4)利用正切的和角公式:tan(a+b)=(tana+tanb)/
化简tan(x+π/4)+tan(x+π/4)
化简tan(x+π/4)+tan(x+π/4)
化简tan(x+π/4)+tan(x+π/4)
利用正切的和角公式:tan(a+b)=(tana+tanb)/(1-tanatanb)
tan(x+π/4)+tan(x+π/4)
=2[tan(x+π/4)]
=2[tanx+tan(π/4)]/[1-tanxtan(π/4)]
=2(tanx+1)/(1-tanx)
=2(1+tanx)/(1-tanx)
至此,即告一段落.要是继续做的话,结果如下:
2(1+tanx)/(1-tanx)
=2[(cosx+sinx)/cosx]/[(cosx-sinx)/cosx]
=2(cosx+sinx)/(cosx-sinx)
=2[(cosx+sinx)^2]/[(cosx-sinx)(cosx+sinx)]
=2(1+2sinxcosx)/[(cosx)^2-(sinx)^2]
=2(1+sin2x)/cos2x
=2/cos2x+2tan2x
原式=2(tanx+1)/(1-tanx)
没意思啊
为什么是tan...+tan..?
干脆就写成2tan...
再说了,即便如此,这不就是直接利用公式吗
出题的人脑残^_^
化简tan(x+π/4)+tan(x+π/4)
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tan(-x+π/4)
tan( x/2+π/4)+tan(x/2-π/4 )=2tanxtan(x/2+π/4)+tan(x/2-π/4)=[tan(x/2)+tan(π/4)]/[1-tan(x/2)tan(π/4)]+[tan(x/2)-tan(π/4)]/[1+tan(x/2)tan(π/4)]=[tan(x/2)+1]/[1-tan(x/2)]+[tan(x/2)-1]/[1+tan(x/2)]=[(tan(x/2)+1)^2-(tan(x/2)-1)^2]/[1-(tan(x
这道题为什么第二步的+到了第三步变成了-1.tan(x/2+π/4)+tan(x/2-π/4)=[tan(x/2)+tan(π/4)]/[1-tan(x/2)tan(π/4)]+[tan(x/2)-tan(π/4)]/[1+tan(x/2)tan(π/4)]=[tan(x/2)+1]/[1-tan(x/2)]+[tan(x/2)-1]/[1+tan(x/2)]=[(tan(x/2)+1)^2-(tan(x/2)-
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