Tìm \[ \propto \] để hàm số \[f\left( x \right) = \left\{ {\begin{array}{*{20}{c}}{{{\left( {1 - \sin 2x} \right)}^{\cot x}},x \ne 0}\\{\alpha ,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,

Tìm \[ \propto \] để hàm số \[f\left( x \right) = \left\{ {\begin{array}{*{20}{c}}{{{\left( {1 - \sin 2x} \right)}^{\cot x}},x \ne 0}\\{\alpha ,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x = 0}\end{array}} \right.\] liên tục tại x₀ = 0.