The value of k so that the function \(f\left( x \right) = \left\{ \begin{array}{l} k\left( {2x - {x^2}} \right),when\,x < 0\\ \cos x,\,\,when\,x \ge 0 \end{array} \right.\)is continuous at x=0, is
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The value of k so that the function \(f\left( x \right) = \left\{ \begin{array}{l} k\left( {2x - {x^2}} \right),when\,x < 0\\ \cos x,\,\,when\,x \ge 0 \end{array} \right.\)is continuous at x=0, is