If \[\underset{x\to 0}{\mathop{\lim }}\,\,\,kx\cos ec\,x=\underset{x\to 0}{\mathop{\lim }}\,x\cos ec\,\,kx,\] then \[k=\]

If \[\underset{x\to 0}{\mathop{\lim }}\,\,\,kx\cos ec\,x=\underset{x\t

1.	If \[\underset{x\to 0}{\mathop{\lim }}\,\,\,kx\cos ec\,x=\underset{x\to 0}{\mathop{\lim }}\,x\cos ec\,\,kx,\] then \[k=\]
A.	1
B.	-1
C.	\[\pm 1\]
D.	\[\pm 2\]
Answer» D. \[\pm 2\]

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If \[\underset{x\to 0}{\mathop{\lim }}\,\,\,kx\cos ec\,x=\underset{x\to 0}{\mathop{\lim }}\,x\cos ec\,\,kx,\] then \[k=\]

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