What's the relationship between COS and sin in the same corner? It's better to say how to prove it Better be specific,
Sin α is sine, cos α is cosine. These are trigonometric functions. The basic relations with trigonometric functions are: 1. Reciprocal relation sin α cos α = 1; Cos α sec α = 1; Tan α cot α = 12, quotient relation Tan α = sin α / cos α; cot α = cot α / sin α 3, square relation sin square α + cos flat