derivative of (1/2) (2 ((tan x)^2 + 1) ((tan x)^2)^(1/2) - (4/3) ((tan x)^2)^(3/2)derivative of (1/2) (2 ((tan x)^2 + 1) ((tan x)^2)^(1/2) - (4/3) ((tan x)^2)^(3/2)

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