Answer: The Church as the most important European institution.
Explanation:
The Church, as the most important European medieval institution, spread its dogmatic norms in various ways. Since it was founded in the Western Roman Empire, it quickly spread to the rest of Europe. There are different ways to spread the influence of this institution. Conquering other peoples is one of those methods. The Church had a great influence on the rulers, so they promoted the Church and its ideals. The Church expanded in parallel with Catholicism, the missionary activity of church ministers the Church also expanded its influence. Throughout history, the Church has spread in an unpopular way, that is, through inquisitorial courts. The Inquisition used various violent methods to expand church influence.
Cos(pi/2 - x) = sin(x). sec(x) = 1/cos(x), so the left side would be sinx/cosx = tanx. So it checks out.
Answer:
the fertilizers used by farmers contaminate the river
