Answer
$- \dfrac{1}{3} \tan x+C $
Work Step by Step
Here, $\int \dfrac{-1}{3} \sec^2 x dx$
Thus, we have $\int ( \dfrac{-1}{3} \sec^2 x ) dx= (-\dfrac{1}{3} )\int \sec^2 x dx=(- \dfrac{1}{3}) \tan x+C $
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