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  4. (d/d x)(( tan x+ sec x-1/ tan x- sec x+1)) is equal to:

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Q. $\frac{d}{d x}\left(\frac{\tan x+\sec x-1}{\tan x-\sec x+1}\right)$ is equal to:

Continuity and Differentiability

Solution:

Answer is $\sec x(\sec x+\tan x)$