[" 2.If "f(x)=(tan x+sec x-1)/(tan x-sec...

[" 2.If "f(x)=(tan x+sec x-1)/(tan x-sec x+1)" ,then "f'(x)" is "],[[" (a) "sec x(tan x-sec x)," (b) "sec x(sec x-tan x)],[" (c) "sec x(sec x+tan x)," (d) none of these "]]

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