Functions defined in terms of a right-angled triangle (see diagram) and widely used in the solution of many mathematical problems. They are defined as:
tangent of angle A, written tanA = a/b
sine of angle A, written sinA = a/c
cosine of angle A, written cosA = b/c,
where a is the length of the side opposite the angle A, b is the length of the side opposite the angle B, and c is the hypotenuse of the triangle. The reciprocal functions are:
cotangent of angle A, written cotA = 1/tanA = b/a
secant of angle A, written secA = 1/cosA = c/b
cosecant of angle A, written cosecA = 1/sinA = c/a
Trigonometric functions
- critical temperature
- critical volume
- CRO
- Crookes, Sir William
- cross product
- cross section
- crucible
- cryogenic pump
- cryogenics
- cryohydrate
- cryometer
- cryoscopic constant
- cryostat
- cryotron
- crystal
- crystal counter
- crystal defect
- crystal habit
- crystal lattice
- crystal microphone
- crystal oscillator
- crystal pick-up
- crystal structure
- crystal system
- crystallography