

$1. I=\displaystyle\int \cos^{2}x\, \mathrm dx\\
2. I=\displaystyle\int \tan^{2}x\,\mathrm dx\\
3. I=\displaystyle\int (\tan x - \cot x)^{2}\, \mathrm dx$
2. I=\displaystyle\int \tan^{2}x\,\mathrm dx\\
3. I=\displaystyle\int (\tan x - \cot x)^{2}\, \mathrm dx$
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