Math141HWAnswers3

Math141HWAnswers3 - (Answers for Chapter 4: Introduction to...

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(Answers for Chapter 4: Introduction to Trigonometry) A.4.1 CHAPTER 4: Introduction to Trigonometry SECTION 4.1: ANGLES 1) a) 48 ± 1 ± 5 , b) 341 ± 4 ± 20 ±± 7 2) a) 22.5 ± , b) 102.298 ± 3) a) 4 ± 9 , b) ± ² 5 , c) 4.735 4) a) 18 ± , b) ± 135 ± , c) 227.1 ± 5) 4.5 inches 6) 4 meters 7) 1 3 [of a radian] 8) 6 QI Acute 3 QI Acute 2 Quadrantal Right 2 3 QII Obtuse 3 4 QII Obtuse Quadrantal None of these 7 6 QIII None of these 3 2 Quadrantal None of these 5 3 QIV None of these 7 4 QIV None of these 9) a) 65 ± , b) 3
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(Answers for Chapter 4: Introduction to Trigonometry) A.4.2 10) a) 130 ± , b) 3 ± 4 11) a) For example, ± 11 ² 6 , 13 6 , and 25 6 ; also, 37 6 . In general: 6 + 2 nn ² ± () . b) For example, ± 315 ± , 405 ± , and 765 ± ; also, 1125 ± . In general: 45 ± + 360 n ± n ± ² . SECTIONS 4.2-4.4: TRIG FUNCTIONS (VALUES AND IDENTITIES) 1) a) 5 3 , b) 5 4 , c) 3 4 , d) 4 3 , e) 1 2) a) 22 9 29 , b) 52 9 29 , c) 2 5 , d) 29 2 , e) 29 5 , f) 5 2 , g) 1 3) a) 12 13 , b) 5 12 , c) 13 5 , d) 13 12 , e) 12 5 , f) 1 4) a) 3 m, b) 32 m 5) a) 43 3 m , b) 83 3 m 6) cos 70 ±
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(Answers for Chapter 4: Introduction to Trigonometry) A.4.3 7) ± sin cos tan csc sec cot 0 0 1 0 und. 1 und. 6 1 2 3 2 3 3 2 23 3 3 4 2 2 2 2 1 2 2 1 3 3 2 1 2 3 3 2 3 3 2 1 0 und. 1 und. 0 8) a) sin 80 ± , b) cos 70 ± , c) tan 80 ± , d) csc 70 ± , e) csc10 ± (Hint: This equals sec 80 ± by the Cofunction Identities.) 9) a) QII, b) QIII, c) QIV, d) QIII 10) a) 6
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Math141HWAnswers3 - (Answers for Chapter 4: Introduction to...

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