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Sine reading fairy or metaphysics?
Sine reading the virtuous.

The correct pronunciation of the word sine is Zheng XIá n, initials and X, finals and Iá n, and the tones are the fourth and second tones.

Expression: Sine is a mathematical term. 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.

Properties of sine function:

1, monotonic interval: sine function monotonically increases on [-π/2+2kπ, π/2+2kπ] and monotonically decreases on [π/2+2kπ, 3π/2+2kπ].

2. Parity: The sine function is odd function.

3. Symmetry: the sine function is symmetric about x=π/2+2kπ axis and symmetric about (kπ, 0) center.

4. Periodicity: The period of sine and cosine function is 2π.