Answer:
Trigonometric functions, also known as trig functions, are mathematical functions that relate the angles of a triangle to the lengths of its sides. The six basic trigonometric functions are:
Sine (sin) - the ratio of the length of the side opposite an angle to the length of the hypotenuse of the right triangle containing that angle.
Cosine (cos) - the ratio of the length of the adjacent side to the length of the hypotenuse of the right triangle containing that angle.
Tangent (tan) - the ratio of the length of the side opposite an angle to the length of the adjacent side of the right triangle containing that angle.
Cosecant (csc) - the reciprocal of the sine function, i.e., the ratio of the length of the hypotenuse to the length of the side opposite an angle.
Secant (sec) - the reciprocal of the cosine function, i.e., the ratio of the length of the hypotenuse to the length of the adjacent side of the right triangle containing that angle.
Cotangent (cot) - the reciprocal of the tangent function, i.e., the ratio of the length of the adjacent side to the length of the side opposite an angle of the right triangle containing that angle.
Trigonometric functions have many applications in mathematics, science, and engineering, including in the fields of physics, astronomy, navigation, and signal processing.