Podcast
Questions and Answers
Which of the following equations is a correct trigonometric identity?
Which of the following equations is a correct trigonometric identity?
- tan θ = sin θ * cos θ
- sin(2θ) = 2sin θ cos θ (correct)
- sin² θ + cos² θ = 2
- tan θ + cot θ = 1
What is the value of sin 45° when expressed as a ratio?
What is the value of sin 45° when expressed as a ratio?
- $\frac{\sqrt{2}}{2}$ (correct)
- $\frac{\sqrt{3}}{3}$
- $\frac{1}{2}$
- $\frac{1}{\sqrt{2}}$
Which trigonometric function helps determine the adjacent side when the angle and hypotenuse are known?
Which trigonometric function helps determine the adjacent side when the angle and hypotenuse are known?
- Cosine (correct)
- Cosecant
- Sine
- Tangent
If sin θ = 0.5, which of the following angles could θ represent within the range 0° to 360°?
If sin θ = 0.5, which of the following angles could θ represent within the range 0° to 360°?
Which of the following is NOT an application of trigonometry?
Which of the following is NOT an application of trigonometry?
Which of these relationships represents the tangent function in terms of sine and cosine?
Which of these relationships represents the tangent function in terms of sine and cosine?
Which inverse trigonometric function is used to determine the angle from a known cosine value?
Which inverse trigonometric function is used to determine the angle from a known cosine value?
What is the graphical representation of sine and cosine functions characterized by?
What is the graphical representation of sine and cosine functions characterized by?
Flashcards
Sine (sin)
Sine (sin)
The ratio of the side opposite to the angle to the hypotenuse.
Cosine (cos)
Cosine (cos)
The ratio of the side adjacent to the angle to the hypotenuse.
Tangent (tan)
Tangent (tan)
The ratio of the side opposite to the angle to the side adjacent to the angle.
Trigonometric Identities
Trigonometric Identities
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Trigonometric Equations
Trigonometric Equations
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Trigonometric Functions
Trigonometric Functions
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Inverse Trigonometric Functions
Inverse Trigonometric Functions
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Pythagorean Theorem
Pythagorean Theorem
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Study Notes
Introduction to Trigonometry
- Trigonometry studies relationships between angles and sides of triangles.
- It is crucial in fields like navigation, surveying, and engineering.
- Trigonometric functions link angles to ratios of sides in right-angled triangles.
Basic Trigonometric Ratios
- Sine (sin): Opposite side / Hypotenuse.
- Cosine (cos): Adjacent side / Hypotenuse.
- Tangent (tan): Opposite side / Adjacent side.
Relationship between Trigonometric Ratios
tan θ = sin θ / cos θ.sin² θ + cos² θ = 1(Pythagorean identity).
Trigonometric Functions and Their Graphs
- Sine, cosine, and tangent functions are cyclical.
- They exhibit periodic behavior, repeating values at regular intervals.
- Their graphs display these cyclical patterns and are essential for understanding their properties.
Trigonometric Identities
- Equations true for all variable values.
- Used to simplify trigonometric expressions.
- Examples include:
sin² θ + cos² θ = 1(Pythagorean identity).tan θ = sin θ / cos θ.
Trigonometric Functions of Special Angles
- Knowing trigonometric function values for specific angles (30°, 45°, and 60°) eases calculations.
- These values stem from 30-60-90 and 45-45-90 triangles.
- Memorization is beneficial.
Inverse Trigonometric Functions
- Inverse functions reverse the original function's operation.
- Used to find angles given trigonometric values.
- Notation includes arcsin (sin⁻¹), arccos (cos⁻¹), and arctan (tan⁻¹).
Applications of Trigonometry
- Navigation: Determining distances and directions using angles.
- Surveying: Measuring land areas and distances via angles.
- Engineering: Designing structures and planning projects using angles.
- Astronomy: Studying celestial objects and positions with angles.
- Physics: Describing motion and forces using angles and lengths.
Trigonometric Equations
- Equations involving trigonometric functions.
- Solving them often involves trigonometric identities and algebraic methods.
- Solutions may have multiple values due to function cycles.
Unit Circle
- A circle of radius 1 centered at the coordinate system's origin.
- Points on the circle represent trigonometric functions for angles.
- A powerful visual aid for understanding trigonometric functions.
Graphs of Trigonometric Functions
- Visual representations of trigonometric functions.
- Show periodicity and other key properties.
- Graphs are valuable for recognizing patterns and problem-solving.
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