This article shows how to prove trigonometric functions using complex numbers and proving various trigonometric formulas.

The article analyzes the state of agricultural lands of the Republic of Uzbekistan and studies the reasons for their reduction. It analyzed the issues of targeted and effective use of agricultural irrigated land and the program of implemented measures to improve their reclamation state, presented relevant proposals for their further effective use.

The article describes the causes of pedagogical conflicts in general schools and ways to solve them. At the same time, methodical recommendations are given to pedagogic staff on the analysis of conflicts that will be useful in the teaching process and prevention of conflicts.

In this article, the concept of localization of production, the opinions of economists, the production of products based on localization in the regional economy, the benefits given by the government to manufacturers of products that replace imports, the role of product production through localization for society are considered.

primary spinal cord tumors are combined with many independent tumors that develop from the spinal parenchyma, its roots, membranes, vertebrae and other structures, which are involved in the formation of the spinal canal, differing in localization, histological structure, clinical development and course prognosis. According to the International Classification of diseases, 10 revisions (ICD 10) distinguish primary spinal cord tumors as benign, malignant histological structure, and cranial nerve spinal tumors.