'Find cos' presentation slideshows

14-4

14-4. Sum and Difference Identities. Warm Up. Lesson Presentation. Lesson Quiz. Holt Algebra 2. Warm Up Find each product, if possible. 1. AB. 2. BA. Objectives. Evaluate trigonometric expressions by using sum and difference identities.

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Essential Questions

Tuesday, March 27. Essential Questions. How do I use Trigonometry to solve word problems?. 1. 2. What is the length of the diagonal of a square with side lengths. The length of the diagonal of a square is 22. What is the length of each side?. 3. 4. 5. 6. 7.

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Does the sin(75) =sin(45)+sin(30) ?

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Bell Work

Bell Work. 1. Find the missing side of each triangle. 7.3 Sine & Cosine Functions. Solving trig. functions of Sin and Cos. Sine and Cosine. Sin ? = Cos ? = From: SOHCAHTOA. Example. If the terminal ray passes through (-3, -4) find sin and cos. Example.

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Sum and Difference Formulas

Sum and Difference Formulas. Unit #5, Day 2. teachers.henrico.k12.va.us/.../5_4%20notes-. Learn these!!. How do we use this?. Finding exact values of trig expressions Split the given number into the sum/difference of unit circle values we know Change the problem using the correct formula

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EXAMPLE 2

adj. to U. adj. to W. =. =. hyp. hyp. WV. 3. UV. 24. 18. 4. =. =. =. =. =. =. 0.6000. 0.8000. 5. 30. 5. 30. UW. UW. EXAMPLE 2. Find cosine ratios. Find cos U and cos W . Write each answer as a fraction and as a decimal. SOLUTION. cos U. cos W.

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EXAMPLE 2

adj. to U. adj. to W. =. =. hyp. hyp. WV. 3. UV. 24. 18. 4. =. =. =. =. =. =. 0.6000. 0.8000. 5. 30. 5. 30. UW. UW. EXAMPLE 2. Find cosine ratios. Find cos U and cos W . Write each answer as a fraction and as a decimal. SOLUTION. cos U. cos W.

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Aim: How do we develop and apply the formula for cos ( A

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Aim: How do we develop and apply the formula for cos ( A

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EXAMPLE 2

adj. to W. adj. to U. =. =. hyp. hyp. UV. 18. WV. 24. =. =. =. =. 3. 30. UW. UW. 30. =. 5. 4. =. 5. EXAMPLE 2. Find cosine ratios. Find cos U and cos W . Write each answer as a fraction and as a decimal. SOLUTION. cos U. = 0.6000. cos W. = 0.8000.

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