This substitution helps solve the 4th order equation
If we need to solve the equation (T^2-1)^2 + 4(T^2-1) + 1 = 0, then obviously the substitution
T1 = (T^2 -1)
is the way to solve it.
Because it transforms the initial equation into
T1^2+4T1+1=0
which is an easy to solve quadratic equation.
Obviously true
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OMG you just wrote T times 1!
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