24. 1 sec x 2sec x 3 tan x4 dx

Apuntes

Here are the corrected and structured mathematical expressions: 24. $$\int \sec x (\sec x + \tan x) \, dx$$ 25. $$\int \frac{\sin t}{\cos^2 t} \, dt$$ 26. $$\int \frac{x^3 + x + 2}{1 + x^2} \, dx$$ 27. $$\int \frac{2x^3 - x^2 + 2x + 4}{1 + x^2} \, dx$$ 28. $$\int \frac{x^6}{1 + x^2} \, dx$$ Each integral is presented in a clear and consistent format, with mathematical symbols correctly transcribed.