# Write each expression as a sum or difference of

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38)Write each expression as a sum or difference of trigonometric functions. (See Example 6).
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40)Write each expression as a product of trigonometric functions. (See Example 7).
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54)Use a half-angle identity to find each exact value. (See Example 8&9). cos195 o A) 3 1301cos30223 2 cos22222 23 32quadrant    o
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flying at 1.4 times the speed of sound. In Exercises 111-114, one of the valuesor m is given. Find the other value.
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22)Find the exact value of each real number y if it exists. Do not use a calculator. (See Examples 1&2).
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32)Find the exact value of each real number y if it exists. Do not use a calculator. (See Examples 1&2).
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40)Give the degree measure ofif it exists. Do not use a calculator. (See Example 3).
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62)Use a calculator to give each real number value. (Be sure the calculator is inradian mode(See Example 4). .
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82)Give the exact value of each expression without using a calculator. (See Examples 5&6). bbbb
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96)Use a calculator to find each value. Give answers as real numbers. 1 sin(cos0.25)
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Section 7.6: #’s 2,20,28,36,50,72,84 2)Concept Check:Refer to the summary box on solving a trigonometric equation following Example 5. Decide on the appropriate technique to begin the solution of each equation. Do Not solve the equation. sin23 x

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