Use a Graphing Utility to Select the Correct Graph $y _ { 1 } \text { and } y _ { 2 }$

question 36

Multiple Choice

Use a graphing utility to select the correct graph $y _ { 1 } \text { and } y _ { 2 }$ in the same viewing window. Use the graphs to determine whether $y _ { 1 } = y _ { 2 }$ .
Explain your reasoning.
$y _ { 1 } = \cos ( x + 6 ) , y _ { 2 } = \cos x + \cos 6$

• A) No, \(y _ { 1 } \neq y _ { 2 }\) because their graphs are different.
• B) No, \(y _ { 1 } \neq y _ { 2 }\) because their graphs are Same.
• C) Yes, \(y _ { 1 } = y _ { 2 }\) because their graphs are different.
• D) Yes, \(y _ { 1 } = y _ { 2 }\) because their graphs are same.
• E) No, \(y _ { 1 } = y _ { 2 }\) because their graphs are different.

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