Integrate: cos2x + 2 sin square x by cos square x
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I = integration of cos2x + 2 sin square x by cos square x
= integration of cos2x + 2(tanx)^2
= integration of cos2x + 2(sec square x - 1)
=sin2x*1/2 + 2tanx - 2x
= integration of cos2x + 2(tanx)^2
= integration of cos2x + 2(sec square x - 1)
=sin2x*1/2 + 2tanx - 2x
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