What's the relationship between COS and sin in the same corner? It's better to say how to prove it Better be specific,

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