Trigonometry is a branch of mathematics that studies the relationships between angles and sides of triangles. This category covers core concepts such as sine, cosine, tangent, and their reciprocal functions. Learners can explore trigonometric identities, equations, and graphs in a structured way. It is essential for solving problems involving angles, distances, and periodic phenomena. Content includes formulas, step-by-step examples, and practice exercises for different difficulty levels. This category is widely used in physics, engineering, architecture, and navigation. It also builds a strong foundation for calculus and advanced mathematical analysis.