교과서 질문
In Exercises 85–96, use a calculator to solve each equation, correct to four decimal places, on the interval [0, 2𝝅). 7 sin² x - 1 = 0
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Ch. 3 - Trigonometric Identities and Equations
Blitzer3rd EditionTrigonometryISBN: 9780137316601
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Table of contents
3장, 문제 102
In Exercises 97–116, use the most appropriate method to solve each equation on the interval [0, 2𝝅). Use exact values where possible or give approximate solutions correct to four decimal places. cos x - 5 = 3 cos x + 6
검증된 단계별 안내1
Start by writing down the given equation: \(\cos x - 5 = 3 \cos x + 6\).
Group like terms to isolate the cosine terms on one side. Subtract \(\cos x\) from both sides and subtract 6 from both sides to get: \(-5 - 6 = 3 \cos x - \cos x\).
Simplify both sides: \(-11 = 2 \cos x\).
Solve for \(\cos x\) by dividing both sides by 2: \(\cos x = \frac{-11}{2}\).
Analyze the value of \(\cos x = -\frac{11}{2}\). Since cosine values must be between -1 and 1, this equation has no solution on the interval \([0, 2\pi)\).
비슷한 문제에 대한 검증된 영상 답변:
이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
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주요 개념
질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.
Solving Trigonometric Equations
Solving trigonometric equations involves isolating the trigonometric function and finding all angle solutions within a given interval. This often requires algebraic manipulation and applying inverse trigonometric functions to determine exact or approximate angle values.
추천 영상:
4:34
How to Solve Linear Trigonometric Equations
Interval Restriction [0, 2π)
The interval [0, 2π) represents one full rotation around the unit circle, covering all possible angle measures in radians for one cycle of trigonometric functions. Solutions must be found only within this range, ensuring all answers correspond to angles between 0 (inclusive) and 2π (exclusive).
추천 영상:
3:43Finding the Domain of an Equation
Using Exact and Approximate Values
Exact values refer to well-known trigonometric values expressed in terms of fractions of π or radicals, while approximate values are decimal representations rounded to a specified precision. Understanding when to use each helps provide precise or practical solutions depending on the problem's requirements.
추천 영상:
04:42Solve Trig Equations Using Identity Substitutions
관련 실천
교과서 질문
In Exercises 97–116, use the most appropriate method to solve each equation on the interval [0, 2𝝅). Use exact values where possible or give approximate solutions correct to four decimal places. sin 2x + sin x = 0
560
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교과서 질문
In Exercises 97–116, use the most appropriate method to solve each equation on the interval [0, 2𝝅). Use exact values where possible or give approximate solutions correct to four decimal places. 2 cos 2x + 1 = 0
557
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교과서 질문
In Exercises 97–116, use the most appropriate method to solve each equation on the interval [0, 2𝝅). Use exact values where possible or give approximate solutions correct to four decimal places. 2 sin² x = 3 - sin x
519
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교과서 질문
In Exercises 97–116, use the most appropriate method to solve each equation on the interval [0, 2𝝅). Use exact values where possible or give approximate solutions correct to four decimal places. tan x sec x = 2 tan x
536
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교과서 질문
In Exercises 97–116, use the most appropriate method to solve each equation on the interval [0, 2𝝅). Use exact values where possible or give approximate solutions correct to four decimal places. 5 cot² x - 15 = 0
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