Tan^-1(2-x+2+x) = 1+2tan^-1x+2

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• Prove that Tan^-1(x-2/x+2)=1/2tan^-1x/2
• solve the equation tan-1(1-x/1+x)=1/2tan-1x
• ∫x​2tan-1x dx
• cos(2tan-1x)=sin(cot-1 3/4)
• solve Cos(2tan-1x)= Sin{Cot-1 3/4}