\[\underset{x\to 0}{\mathop{\lim }}\,\left[ \cos e{{c}^{3}}x.\cot x-2{{\cot }^{3}}x.\cos ecx+\frac{{{\cot }^{4}}x}{\sec x} \right]\] is equal to

\[\underset{x\to 0}{\mathop{\lim }}\,\left[ \cos e{{c}^{3}}x.\cot x-2{

1.	\[\underset{x\to 0}{\mathop{\lim }}\,\left[ \cos e{{c}^{3}}x.\cot x-2{{\cot }^{3}}x.\cos ecx+\frac{{{\cot }^{4}}x}{\sec x} \right]\] is equal to
A.	1
B.	-1
C.	0
D.	None of these
Answer» B. -1

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\[\underset{x\to 0}{\mathop{\lim }}\,\left[ \cos e{{c}^{3}}x.\cot x-2{{\cot }^{3}}x.\cos ecx+\frac{{{\cot }^{4}}x}{\sec x} \right]\] is equal to

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