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Write the value of int(d(x^2+1))/(1+x^4)...

Write the value of `int(d(x^2+1))/(1+x^4)`dx

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`int(d(x^2+1))/(1+x^2)``int(d(x^2+1))/(1+x^4)=int(2xdx)/(1+(x^2)^2)`=`int(dt)/(1+t^2)=tna6-1x^2+c`
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