Table 1 The signs at the important values of x

t

0

⋯

${\mathit{t}}_{\mathbf{1}}\mathbf{(}\mathit{\theta }\mathbf{)}$

⋯

$\sqrt{\mathbf{2}\mathbf{(}\mathit{\theta }\mathbf{\wedge }\mathbf{(}\mathit{\theta }\mathbf{-}\mathbf{1}\mathbf{)}\mathbf{)}}$

⋯

1