関連ワード:  integrate sec 2 x 3 tan x    integrate sec 2 x 3 tan x dx    integrate (sec^2x)/(tan^3 x + 4 tan x) dx    integrate sec 2 x 1 tan x 3 dx    integral sec 2 x 1 tan x 3    integrate 2x sec 3 x 2 3 tan x 2 3    integrate 2x * sec 3 x 2 3 * tan x 2 3 dx    what is the integral of sec^2(x)    what is the antiderivative of sec(x)tan(x)