\displaystyle \begin{aligned} I & = \int \dfrac{dx}{\sin x \cos x} \\ & = \int \dfrac{\sec^2 x}{\tan x}\ dx
\displaystyle \begin{aligned} I & = \int \dfrac{dx}{\sin x \cos x} \\ & = \int \dfrac{\sec^2 x}{\tan x}\ dx
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