Trigonometric functions
Trigonometric functions 76 languages Article Talk Read Edit View history From Wikipedia, the free encyclopedia Trigonometry Outline History Usage Functions ( inverse ) Generalized trigonometry Reference Identities Exact constants Tables Unit circle Laws and theorems Sines Cosines Tangents Cotangents Pythagorean theorem Calculus Trigonometric substitution Integrals ( inverse functions ) Derivatives v t e Basis of trigonometry: if two right triangles have equal acute angles , they are similar , so their side lengths are proportional . In mathematics , the trigonometric functions (also called circular functions , angle functions or goniometric functions [1] [2] ) are real functions which relate an angle of a right-angled triangle to ratios of two side lengths. They are widely used in all sciences that are related to geometry , such as navigation , solid mecha...