If \[x=\sec \,\varphi -\tan \varphi ,y=\text{cosec}\varphi +\cot \varphi ,\]then

If \[x=\sec \,\varphi -\tan \varphi ,y=\text{cosec}\varphi +\cot \varp

1.	If \[x=\sec \,\varphi -\tan \varphi ,y=\text{cosec}\varphi +\cot \varphi ,\]then
A.	\[x=\frac{y+1}{y-1}\]
B.	\[x=\frac{y-1}{y+1}\]
C.	\[y=\frac{1-x}{1+x}\]
D.	None of these
Answer» C. \[y=\frac{1-x}{1+x}\]

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If \[x=\sec \,\varphi -\tan \varphi ,y=\text{cosec}\varphi +\cot \varphi ,\]then

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