Sin(θ)= length of opposite side/length of hypotenuse. Where θ is the angle we are looking for, the opposite side is the opposite side of the right triangle and the hypotenuse is the longest side of the right triangle. For sin36 degrees, we don't need to manually calculate or use complicated formulas, because this is a standard trigonometric function value, and we can directly look it up or use a calculator to get the answer. The calculation result is: sin36 degrees =0.5878.

Sinusoidal functions are widely used in mathematics and physics, especially in the fields of fluctuation, vibration, alternating current, signal processing and so on. The graph of sine function is a continuous waveform with periodicity and symmetry. Therefore, it is often used to describe phenomena with periodic changes, such as the fluctuation of sound and the propagation of electromagnetic waves. In addition, sine function is also the basis of many more complex mathematical and physical formulas, such as Fourier series, wave equation and so on. The properties and characteristics of sine function play a key role in solving these higher-level problems.