4. If f(x) = 2* tan tan x, then f (x) =
(A) f (x) = 2* In In 2 x
(B) f (x) = 2 (tan tan x + sec sec x)
(C) f(x) = 2*x
(D) f (x) =
x2-¹ tan tan x + 2 x
(E) f (x) = 2* (In In 2 tan tan x + x)
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OL
1:00.