t=x^2
dt=2x*dx
dx=dt/2
0.5∫dt/√(t^2-1)=0.5*ln|t+√(t^2-1)|+C=0.5ln|x^2+√(x^4-1)|+C
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t=x^2
dt=2x*dx
dx=dt/2
0.5∫dt/√(t^2-1)=0.5*ln|t+√(t^2-1)|+C=0.5ln|x^2+√(x^4-1)|+C