यदि \(\mathop {\lim }\limits_{x \to 0} kx\cot x = \mathop {\lim }\limits_{x \to 0} x\cot kx,\) तो k का मान है

1
केवल 1
2
केवल -1
3
± 1
4
± \(\frac{1}{2}\)

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