\[\underset{y\to 0}{\mathop{\lim }}\,\frac{(x+y)\sec (x+y)-x\sec x}{y}=\] [AI CBSE 1990]

\[\underset{y\to 0}{\mathop{\lim }}\,\frac{(x+y)\sec (x+y)-x\sec x}{y}

1.	\[\underset{y\to 0}{\mathop{\lim }}\,\frac{(x+y)\sec (x+y)-x\sec x}{y}=\] [AI CBSE 1990]
A.	\[\sec x(x\tan x+1)\]
B.	\[x\tan x+\sec x\]
C.	\[x\sec x+\tan x\]
D.	None of these
Answer» B. \[x\tan x+\sec x\]

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\[\underset{y\to 0}{\mathop{\lim }}\,\frac{(x+y)\sec (x+y)-x\sec x}{y}=\] [AI CBSE 1990]

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