Podcast
Questions and Answers
What is the function of the "Create Table" button in the provided images?
What is the function of the "Create Table" button in the provided images?
- To define the structure of a new table (correct)
- To import data into a table
- To add rows to an existing table
- To create a new database
Which of the following data types would be most appropriate for storing a customer's phone number?
Which of the following data types would be most appropriate for storing a customer's phone number?
- DECIMAL
- VARCHAR (correct)
- DATE
- INT
What is the primary key in the "Customers" table?
What is the primary key in the "Customers" table?
- CustomerName
- CustomerID (correct)
- ContactName
- Address
What does the constraint "NOT NULL" ensure about a column?
What does the constraint "NOT NULL" ensure about a column?
Which of the following SQL statements would be used to retrieve all customer information from the Customers table, sorted alphabetically by customer name?
Which of the following SQL statements would be used to retrieve all customer information from the Customers table, sorted alphabetically by customer name?
What kind of database is being designed in the image above?
What kind of database is being designed in the image above?
What does the constraint 'NOT NULL' indicate about the 'CustomerID' column in the 'Customers' table?
What does the constraint 'NOT NULL' indicate about the 'CustomerID' column in the 'Customers' table?
How many tables are being designed in the images provided?
How many tables are being designed in the images provided?
What type of relationship exists between the 'Customers' and 'Orders' tables?
What type of relationship exists between the 'Customers' and 'Orders' tables?
What is the purpose of the 'Order_Details' table?
What is the purpose of the 'Order_Details' table?
Flashcards
Image Analysis
Image Analysis
The process of examining and interpreting visual images.
Critical Thinking
Critical Thinking
The objective analysis and evaluation of an issue to form a judgment.
Visual Perception
Visual Perception
The ability to interpret and make sense of visual stimuli.
Media Literacy
Media Literacy
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Interpretation Skills
Interpretation Skills
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Image Composition
Image Composition
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Visual Hierarchy
Visual Hierarchy
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Color Theory
Color Theory
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Audience Analysis
Audience Analysis
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Gestalt Principles
Gestalt Principles
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Study Notes
Trigonometric Functions of Any Angle
- Trigonometric functions can be defined for any angle, not just acute angles.
- A trigonometric function of an angle θ in standard position is defined using a point (x, y) on the terminal side of the angle and the distance r from the origin to the point.
- sin θ = y/r
- cos θ = x/r
- tan θ = y/x
- cot θ = x/y
- sec θ = r/x
- csc θ = r/y
Evaluating Trigonometric Functions
- Given a point (x, y) on the terminal side of an angle θ, calculate r = √(x² + y²)
- Substitute x, y, and r into formulas to find the values of the trigonometric functions
Example 1: Evaluating Trigonometric Functions
- Point: (-3, 4)
- Calculate r = √((-3)² + 4²) = 5
- sin θ = 4/5
- cos θ = -3/5
- tan θ = -4/3
Trigonometric Functions in Different Quadrants
- The signs of the trigonometric functions differ in the four quadrants.
- Quadrant I: all positive
- Quadrant II: sin positive, cos and tan negative
- Quadrant III: tan positive, sin and cos negative
- Quadrant IV: cos positive, sin and tan negative
Example 2: Evaluating Trigonometric Functions
- Given sin θ = 3/5 and tan θ > 0
- Determine the quadrant (Quadrant I)
- Using the Pythagorean identity, find cos θ = ±4/5
- Since tan θ > 0, cos θ = 4/5 (Quadrant I or III). In this case, since sin θ is positive and tan θ is positive, the angle must be in Quadrant I.
- cot θ = 4/3
Trigonometric Functions of Quadrant Angles
- Evaluate sine and cosine at 0, π/2, π, 3π/2
- sin 0 = 0, cos 0 = 1
- sin π/2 = 1, cos π/2 = 0
- sin π = 0, cos π = -1
- sin 3Ï€/2 = -1, cos 3Ï€/2 = 0
Definition of Reference Angle
- The acute angle formed by the terminal side of an angle and the x-axis.
- used to find the values of trigonometric functions of any angle
Example 4: Finding Reference Angles
- Given angles in degrees or radians, calculate the reference angle
- 300°, reference angle = 60°
- 2.3 radians, reference angle (approximately) = 0.85 radians
- 135°, reference angle = 45°
Example 5: Trigonometric Functions of Nonacute Angles
- Calculate trigonometric function values for given non-acute angles using their reference angles
- cos (4Ï€/3) = -1/2
- tan(-210°) = √3
- csc (11π/4) = √2
Example 6: Using Trigonometric Identities
- Given sin θ and θ is in Quadrant II, find cos θ using identities like sin²θ + cos²θ = 1. This requires determining the correct sign for cos θ to ensure it falls in the correct quadrant. Important to note the quadrant.
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