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eroshea
arctan(2x)+tan(x)=pi/4, what is x?
arctan(2x)+tan(x)=pi/4 ?? or arctan(2x)+arctan(x)=pi/4
if it is latter, then use arctanA+arctanB = arctan((A+B)/(1-AB)) then take tan on both sides. tan pi/4=1
u get 3x=1-2x^2 solve this quadatic
thanks!! i had solve it now :)) could you answer the other question i had closed?? the one with the round holes?