यदि \(f\left( x\right) =\left\{ \left| x\right| \cos \begin{pmatrix} \dfrac{1}{x} \\ k \end{pmatrix}+9x^2 \begin{matrix} \rm{if} \ x \ne 0 \\\ \rm{if}\ x = 0 \end{matrix}\right\}\) तो f सतत है यदि k का मान है:

1
0
2
3
3
9
4
6

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