(x tan x)/(sec x+tan x)

Find the range of the function f(x) = (sec^2x - tan x)/(sec^2 x + tan x) , (-pi/2 lt x lt pi/2) .

Prove that (1)/(sec x-tan x)+(1)/(sec x+tan x)=(2)/(cos x)

Let f (x)= (e ^(tan x) -e ^(x) +ln (sec x+ tan x)-x)/(tan x-x) be a continous function at x=0. The value of f (0) equals:

tan^(-1)(sec x+tan x)

Is (sec x + tan x + 1)(sec x - tan x - 1) - 2tan x = 0 an identity.

What is the simplified value of [ ((sec^(3)x - tan^(3)x ))/((sec x - tan x ))]-2 tan^(2)x - sec x tan x ?

If int e^(sec x)(sec x tan x f(x)+(sec x tan x + sec^(2) x))dx = e^(sec x)f(x) + C , then a possible choice of f(x) is

If int e^(sec x)(sec x tan x f(x)+(sec x tan x + sec^(2) x))dx = e^(sec x)f(x) + C , then a possible choice of f(x) is

If int e^(sec x)(sec x tan x f(x)+(sec x tan x + sec^(2) x))dx = e^(sec x)f(x) + C , then a possible choice of f(x) is