Basic Trigonometric Functions:

• sin θ = opposite / hypotenuse
• cos θ = adjacent / hypotenuse
• tan θ = opposite / adjacent = sin θ / cos θ
• cot θ = adjacent / opposite = cos θ / sin θ
• sec θ = hypotenuse / adjacent = 1 / cos θ
• csc θ = hypotenuse / opposite = 1 / sin θ

Special Cases:

• tan 90° → ∞
• cot 0° → ∞
• sec 90° → ∞
• csc 0° → ∞