Find the Specified Quantity $y = - 2 \cos \left( 3 x + \frac { \pi } { 4 } \right)$

question 28

Multiple Choice

Find the specified quantity.
-Find the amplitude of $y = - 2 \cos \left( 3 x + \frac { \pi } { 4 } \right)$ .

• A) \(\frac { \pi } { 2 }\)
• B) 2
• C) \(- 6\)
• D) 3

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