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int \ (sin 2x)/(sin^2 x + 2 cos^2 x) \ d...

`int \ (sin 2x)/(sin^2 x + 2 cos^2 x) \ dx` (i) `-log(1+sin^2x)+C` (ii) `log(1+cos^2x)+C` (iii) `-log(1+cos^2x)+C` (iv)`log(1+tan^2x)+C`

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