Theoretical lectures:Indefinite integral; definite integral and application; improper integral. Ordinary differential equations of first and higher order. Linear differential equations of n-th order. Series, functional sequence and functional series, power series, Fourier series. Double, curved-line integral. Complex analysis: Cauchy theorems and formulas Laurent series, singularities , residues. Fourier series and transformation. Laplace transform and inverse Laplace transform and application. Practice (Exercises): Corresponding examples from theoretical lectures are done in exercises, thus practicing the taught lectures and understanding them better.