Problem 56
Question
Give the domain and range of the function. $$F(x)=1+\sin x$$.
Step-by-Step Solution
Verified Answer
The domain of the function \(F(x)=1+\sin(x)\) is all real numbers (\(x \in (-\infty, \infty)\)), and the range is \(F(x) \in [0,2]\).
1Step 1: Identify the Domain
Determine the set of all possible \(x\) values that can be inputted into the function. As we're dealing with the sine function here, the domain would be all real numbers, as there are no restrictions on the input for the sine function. So, the domain is \(x \in (-\infty, \infty)\).
2Step 2: Identify the Range
Determine the set of all possible output values, or \(F(x)\) values, that can be obtained from the function. The sine function oscillates between -1 and 1. Hence, \(1+ \sin(x)\) will oscillate between 0 and 2. So, the range is \(F(x) \in [0,2]\).
Key Concepts
Trigonometric FunctionsSine FunctionFunction Transformation
Trigonometric Functions
Trigonometric functions are fundamental in mathematics, as they relate the angles of a triangle to the lengths of its sides. There are six principal trigonometric functions, and among these, the sine function is one of the most widely recognized and utilized.
The domain of trigonometric functions depends on the input they can accept. For instance, the sine and cosine functions can take any real number as their input, leading to their domain being all real numbers, expressed as \( x \in (-\infty, \infty) \). This property makes them periodic, as they repeat values over regular intervals, specifically every \(2\pi\) radians. Trigonometric functions are utilized across various fields such as physics, engineering, and computer science to model periodic phenomena.
The domain of trigonometric functions depends on the input they can accept. For instance, the sine and cosine functions can take any real number as their input, leading to their domain being all real numbers, expressed as \( x \in (-\infty, \infty) \). This property makes them periodic, as they repeat values over regular intervals, specifically every \(2\pi\) radians. Trigonometric functions are utilized across various fields such as physics, engineering, and computer science to model periodic phenomena.
Sine Function
The sine function, denoted as \(\sin(x)\), is one of the primary trigonometric functions. It's defined for all real numbers and can be visualized as a smooth, continuous wave that oscillates between -1 and 1. This characteristic wave patterns represent the function's output or range, which for the basic sine function is \(\sin(x) \in [-1,1]\).
The function's behavior is inherently linked to the concept of angles and circles, as \(\sin(x)\) can be interpreted as the y-coordinate of a point on the unit circle that subtends an angle of \(x\) radians from the origin. The graph of \(\sin(x)\) shows repetitive peaks and troughs, defining its periodic nature with a regular period of \(2\pi\) radians.
The function's behavior is inherently linked to the concept of angles and circles, as \(\sin(x)\) can be interpreted as the y-coordinate of a point on the unit circle that subtends an angle of \(x\) radians from the origin. The graph of \(\sin(x)\) shows repetitive peaks and troughs, defining its periodic nature with a regular period of \(2\pi\) radians.
Function Transformation
In mathematics, a function transformation involves altering the basic graph of a function according to specific rules that correspond to the mathematical operations applied to the function's formula. When you introduce a transformation, such as adding a number to the function, it shifts the graph up or down; this is known as a vertical translation.
For example, the function \(F(x) = 1 + \sin(x)\) is a transformation of the basic sine function where +1 has been added to the entire function. This transformation leads to a vertical shift upwards by 1 unit. As a result, the wave which used to oscillate between -1 and 1, now oscillates between 0 and 2. This kind of transformation does not affect the domain of the function; however, it changes the range, as seen in the solution for the range of \(F(x)\), where \(F(x) \in [0,2]\). Function transformations allow further exploration into more complex behavior of functions and broadening their applications in different contexts.
For example, the function \(F(x) = 1 + \sin(x)\) is a transformation of the basic sine function where +1 has been added to the entire function. This transformation leads to a vertical shift upwards by 1 unit. As a result, the wave which used to oscillate between -1 and 1, now oscillates between 0 and 2. This kind of transformation does not affect the domain of the function; however, it changes the range, as seen in the solution for the range of \(F(x)\), where \(F(x) \in [0,2]\). Function transformations allow further exploration into more complex behavior of functions and broadening their applications in different contexts.
Other exercises in this chapter
Problem 56
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