The terms "sinus" and "cosinus" refer to the **sine** and **cosine** functions, which are fundamental in trigonometry. These functions relate the angles of a right triangle to the lengths of its sides. 

### Sine (sin)
The sine of an angle in a right triangle is the ratio of the length of the opposite side to the length of the hypotenuse. For an angle \( \theta \):

\[
\sin(\theta) = \frac{\text{opposite side}}{\text{hypotenuse}}
\]

### Cosine (cos)
The cosine of an angle in a right triangle is the ratio of the length of the adjacent side to the length of the hypotenuse. For an angle \( \theta \):

\[
\cos(\theta) = \frac{\text{adjacent side}}{\text{hypotenuse}}
\]

These functions are also defined for all real numbers using the unit circle, where they describe the coordinates of points on the circle.

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### Related Questions:
1. What are the sine and cosine functions used for in practical applications?
2. How are the sine and cosine functions related to the unit circle?
3. Can sine and cosine values be greater than 1?
4. What are the sine and cosine values for common angles like 0°, 30°, 45°, 60°, and 90°?
5. What is the relationship between sine and cosine for complementary angles?
6. How do the sine and cosine functions relate to the other trigonometric functions like tangent?
7. How do you calculate the sine and cosine of an angle given in radians instead of degrees?
8. What are the amplitude, period, and phase shift in the context of sine and cosine wave functions?

### Tip
Remember that sine and cosine are periodic functions with a period of \(2\pi\) radians (or 360°), meaning they repeat their values in cycles.

Explore the definitions and applications of sine and cosine functions in trigonometry. This detailed explanation covers how these functions relate angles to the sides of a right triangle and their broader applications using the unit circle.

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