You can find digital versions of these solutions on popular Russian educational sites like GDZ.ru , Reshak.ru , or MegaResheba , which allow you to search by specific task number or page.
The book by B.G. Ziv and V.A. Goltsov is a popular Russian educational resource designed to supplement the standard algebra curriculum with tests, independent work, and control assessments. You can find digital versions of these solutions
Trigonometric functions, derivatives, and their applications. and control assessments. Trigonometric functions
Integrals, exponential and logarithmic functions, and equations/inequalities. 2. Control Work (Kontrolnye Raboty) and their applications. Integrals