If \[\theta ={{\tan }^{-1}}a,\varphi ={{\tan }^{-1}}b\] and \[ab=-1,\] – McqOptions

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1.	If \[\theta ={{\tan }^{-1}}a,\varphi ={{\tan }^{-1}}b\] and \[ab=-1,\] then \[\theta -\varphi =\]
A.	0
B.	\[\frac{\pi }{4}\]
C.	\[\frac{\pi }{2}\]
D.	None of these
Answer» D. None of these

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