化简tan(x/2+π/4)-tan(π/4-x/2)
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化简tan(x/2+π/4)-tan(π/4-x/2)
化简tan(x/2+π/4)-tan(π/4-x/2)
化简tan(x/2+π/4)-tan(π/4-x/2)
tan[a+b]= [tana+tanb]/(1-tanatab)
tan[a-b]= [tana-tanb]/(1+tanatab)
tan(x/2+π/4)-tan(π/4-x/2)
= [tan(x/2)+1]/[1-tan(x/2)] - [1-tan(x/2)]/[1+tan(x/2)]
= {[tan(x/2)+1]^2-[1-tan(x/2)]^2}/[1-tan^2(x/2)]
= 4tan(x/2)/[1-tan^2(x/2)]
= 4tan(x/2)cos^2(x/2)/[1-tan^2(x/2)]cos^2(x/2)
= 4sin(x/2)cos(x/2)/[cos^2(x/2) -sin^2(x/2)]
= 2sinx/cosx
= 2tanx
如下:
原式=(1+tanx/2)/(1-tanx/2)-(1-tanx/2)/(1+tanx/2)=(4*tanx/2)/(1-tanx/2平方)=2tanx
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
化简tan(x+π/4)+tan(x+π/4)
化简tan(x+π/4)-tan(x-π/4)
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)-
tan(-x+π/4)
化简tan(x/2+π/4)-tan(π/4-x/2)
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