Functions and Modeling - Unit 1 Quiz

Unit 1: Functions and Modeling

• Functions are relationships between inputs (domain) and outputs (range). A function assigns exactly one output to each input.
• Function notation: f(x) represents the output of function f for input x.
• Domain and range: The domain is the set of all possible input values, and the range is the set of all possible output values.
• Types of functions: Linear, quadratic, polynomial, rational, radical, exponential, logarithmic. Understanding their graphs, equations, and characteristics is crucial.
• Identifying functions from tables, graphs, or equations. Be able to determine if a graph or set of points represents a function using the vertical line test.
• Function transformations: Vertical shifts, horizontal shifts, reflections, stretches, and compressions. Knowing how to apply these transformations to graphs and equations is important.
• Combining functions: Addition, subtraction, multiplication, division, composition (applying one function to the output of another - f(g(x))).
• Inverse functions: A function that undoes another function. The inverse of f(x) is denoted as f^-1(x). Rules for finding inverse functions and recognizing if a function has an inverse graphically are important.
• Piecewise functions: Functions defined by different rules on different parts of their domain. Graphing and evaluating piecewise functions requires careful attention to the conditions.

Unit 3: Trigonometry

• Trigonometric functions relate angles in a right triangle to ratios of sides.
• The six trigonometric functions: sine (sin), cosine (cos), tangent (tan), cosecant (csc), secant (sec), cotangent (cot). Understanding their definitions, relationships, and reciprocal relationships.
• Trigonometric identities: Equations that are true for all values of the variable, such as sin²x + cos²x = 1. Knowing key identities is vital for solving problems.
• Graphing trigonometric functions: Sine, cosine, tangent, etc. Understanding their amplitude, period, and phase shifts.
• Solving trigonometric equations: Finding values of the variable that satisfy the equation. This often involves using identities, unit circle values, inverse trigonometric functions, and algebraic techniques.
• Applications of trigonometry: Using trigonometric functions to solve problems in various contexts, e.g., finding heights or distances.
• Unit circle: A circle with a radius of 1 centered at the origin, used to define and visualize trigonometric functions for angles. Memorizing common reference angles and their corresponding values in the unit circle is crucial.
• Trigonometric identities and their applications in simplifying expressions and solving equations are essential.
• Law of Sines and Law of Cosines: Used to solve triangles when angle-side information is not in a right triangle; understanding the triangle cases for each.
• Inverse trigonometric functions: Finding the angle given a trigonometric value, including understanding domain/range restrictions. Using them to solve equations.
• Connections between Units: It's important to recognize the connections between these units, for instance, how function transformations can be applied to trigonometric graphs. Also notice how exponential and logarithmic functions are different than trigonometric functions.