tan(a+b)=2/5 tan(a+π/4)=3/22 那么tan(b-π/4)等于?

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tan(a+b)=2/5tan(a+π/4)=3/22那么tan(b-π/4)等于?tan(a+b)=2/5tan(a+π/4)=3/22那么tan(b-π/4)等于?tan(a+b)=2/5tan(

tan(a+b)=2/5 tan(a+π/4)=3/22 那么tan(b-π/4)等于?
tan(a+b)=2/5 tan(a+π/4)=3/22 那么tan(b-π/4)等于?

tan(a+b)=2/5 tan(a+π/4)=3/22 那么tan(b-π/4)等于?
tan(a+b)=tan[(b-π/4)+(a+π/4)]=]tan(b-π/4)+tan(a+π/4)]/[1-tan(b-π/4)tan(a+π/4)]
tan(a+b)=3/22 tan(a+π/4)=15/44
3/22=(x+15/44)/(1-x*15/44)
x+15/44=3/22-45/968*x
1013/968*x=-9/44
x=-198/1013