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Question
Find `int (sin^2 x - cos^2x)/(sin x cos x) dx`
Solution
`int (sin^2 x - cos^2x)/(sin x cos x) dx`
= `int (sin^2 x)/(sin x cos x) dx - int (cos^2 x)/(sin x cos x) dx`
= `int tan x dx - int cot x dx`
= log |sec x| - log |sin x| + C
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