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Chapter 5: Problem 51

Determine the quadrant in which each angle lies. (The angle measure is given in radians.) (a) \(\frac{\pi}{6}\) (b) \(\frac{5 \pi}{4}\)

Short Answer

Expert verified
Angle \(\frac{\pi}{6}\) is in the first quadrant and angle \(\frac{5\pi}{4}\) is in the third quadrant.

Step by step solution

01

Determine the Quadrant for angle \(\frac{\pi}{6}\)

An angle measure of \(\frac{\pi}{6}\) radians falls in the first quadrant, because it is less than \(\frac{\pi}{2}\) (which is half of \(\pi\)). The first quadrant contains all angles between 0 and \(\frac{\pi}{2}\).
02

Determine the Quadrant for angle \(\frac{5\pi}{4}\)

An angle measure of \(\frac{5\pi}{4}\) radians falls in the third quadrant. This is because \(\frac{5\pi}{4}\) is less than \(2\pi\) (full circle) but more than \(\pi\) (half circle). Thus, it travels more than half circle but less than a full circle, placing it in the third quadrant.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Radians
Radians play a crucial role in mathematics, especially in trigonometry and geometry. They provide an alternative way to measure angles distinct from the conventional degree system.
  • Radians are based on the radius of a circle. By definition, when the arc length of a circle equals the radius length, the angle subtended at the center of the circle is 1 radian.
  • To convert between radians and degrees, remember: \[ 180^\circ = \pi \text{ radians} \]
Thus, converting degrees to radians involves multiplying by \(\frac{\pi}{180}\), and vice versa, multiplying by \(\frac{180}{\pi}\).

When dealing with trigonometric functions or angle measurements in calculus, radians offer mathematical elegance and simplicity. Most formulas involving trigonometric functions, such as sine and cosine, are naturally expressed in radians, making calculations and theoretical work straightforward.

Understanding radians deepens the comprehension of angle-related concepts in geometry and physics. It allows learners to bridge different areas of mathematics seamlessly.
Angle Measurement
Understanding angle measurement is key to a variety of mathematical applications, including graphing and solving trigonometric functions.
  • Each angle can be represented in degrees or radians, offering different perspectives depending on the context.
  • The full circle is measured as 360 degrees or \(2\pi\) radians. This equivalence is pivotal in various calculations.
When measuring angles, it's essential to comprehend the context or quadrant they are in:

- **First Quadrant:** Angles range from 0 to \(\frac{\pi}{2}\) radians, or from 0 to 90 degrees.- **Second Quadrant:** Angles range from \(\frac{\pi}{2}\) to \(\pi\) radians, or from 90 to 180 degrees.- **Third Quadrant:** Angles range from \(\pi\) to \(\frac{3\pi}{2}\) radians, or from 180 to 270 degrees.- **Fourth Quadrant:** Angles range from \(\frac{3\pi}{2}\) to \(2\pi\) radians, or from 270 to 360 degrees.

By identifying the quadrant, you determine the properties and signs of trigonometric functions (e.g., sine and cosine are positive in the first quadrant).

Understanding angle measurements enhances solving problems in physics, astronomy, and various engineering fields.
Trigonometry
Trigonometry is the branch of mathematics that tackles the relationships between the sides and angles of triangles. It reaches into more complex areas involving circles and periodic functions.
  • Six fundamental trigonometric functions form the basis: sine, cosine, tangent, cosecant, secant, and cotangent.
  • These functions help connect angle measures to ratios of triangle sides, allowing various applications beyond geometry, such as analyzing wave functions.
Central to trigonometry is the unit circle, where angles are often expressed in radians. The unit circle facilitates understanding

  • periodic nature of trigonometric functions,
  • common angle identities and their simplifications,
  • the sign changes of sine and cosine across quadrants based on angle measurement.
Understanding trigonometry empowers students to tackle real-world problems involving oscillations, waves, and circular motions. It sets a foundation for advanced topics in calculus and analytical geometry.

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Most popular questions from this chapter

Determine whether the statement is true or false. Justify your answer. $$\sin \theta < \cos \theta \text { for } 0^{\circ} < \theta < 45^{\circ}$$

A six-foot person walks from the base of a streetlight directly toward the tip of the shadow cast by the streetlight. When the person is 16 feet from the streetlight and 5 feet from the tip of the streetlight's shadow, the person's shadow starts to appear beyond the streetlight's shadow. (a) Draw a right triangle that gives a visual representation of the problem. Show the known quantities and use a variable to indicate the height of the streetlight. (b) Use a trigonometric function to write an equation involving the unknown quantity. (c) What is the height of the streetlight?

Find the exact value of each function for the given angle for \(f(\theta)=\sin \theta\) and \(g(\theta)=\cos \theta .\) Do not use a calculator. (a) \((f+g)(\theta)\) (b) \((g-f)(\theta)\) (c) \([g(\theta)]^{2}\) (d) \((f g)(\theta)\) (e) \(f(2 \theta)\) (f) \(g(-\boldsymbol{\theta})\) $$\theta=5 \pi / 2$$

Define the inverse secant function by restricting the domain of the secant function to the intervals \([0, \pi / 2)\) and \((\pi / 2, \pi],\) and sketch the graph of the inverse function.

Using calculus, it can be shown that the sine and cosine functions can be approximated by the polynomials $$\sin x \approx x-\frac{x^{3}}{3 !}+\frac{x^{5}}{5 !} \quad \text { and } \quad \cos x \approx 1-\frac{x^{2}}{2 !}+\frac{x^{4}}{4 !}$$ where \(x\) is in radians. (a) Use a graphing utility to graph the sine function and its polynomial approximation in the same viewing window. How do the graphs compare? (b) Use the graphing utility to graph the cosine function and its polynomial approximation in the same viewing window. How do the graphs compare? (c) Study the patterns in the polynomial approximations of the sine and cosine functions and predict the next term in each. Then repeat parts (a) and (b). How did the accuracy of the approximations change when an additional term was added?
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