Trigonometrie: SINUS, COSINUS, TANGENTA, COTANGENTA

Introductory notions of trigonometry, trigonometric ratios: sine, cosine, tangent, cotangent. On my blog https://matera.ro/ you can find video lessons of mathematics, articles with theory and exercises solved step by step and test models with solutions. Facebook:   / eusorsainvetisingur   #eUsorSaInvetiSingur