Sine formula is a related formula to describe sine theorem, which is a basic theorem in trigonometry. It points out that in any plane triangle, the ratio of the sine value of each side to its diagonal is equal to and equal to the diameter of the circumscribed circle. Geometrically, sine formula is sine theorem.
In a right triangle, the ratio of the opposite side to the hypotenuse of any acute angle ∠A is called the sine of ∠A, which is abbreviated from the English word sine, that is, the opposite side/hypotenuse of Sina = ∠ A.
Trigonometric function:
Trigonometric function is a kind of transcendental function in elementary function in mathematics.
Their essence is the mapping between the set of arbitrary angles and a set of ratio variables. The usual trigonometric function is defined in the plane rectangular coordinate system, and its domain is the whole real number domain.
The other is defined in a right triangle, but it is incomplete. Modern mathematics describes them as the limit of infinite sequence and the solution of differential equation, and extends their definitions to complex system.