\[y={{(\tan x)}^{{{(\tan x)}^{\tan x}}}},\] then at\[x=\frac{\pi }{4}\], the value of \[\frac{dy}{dx}=\] [WB JEE 1990]

\[y={{(\tan x)}^{{{(\tan x)}^{\tan x}}}},\] then at\[x=\frac{\pi }{4

1.	\[y={{(\tan x)}^{{{(\tan x)}^{\tan x}}}},\] then at\[x=\frac{\pi }{4}\], the value of \[\frac{dy}{dx}=\] [WB JEE 1990]
A.	0
B.	1
C.	2
D.	None of these
Answer» D. None of these

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\[y={{(\tan x)}^{{{(\tan x)}^{\tan x}}}},\] then at\[x=\frac{\pi }{4}\], the value of \[\frac{dy}{dx}=\] [WB JEE 1990]

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