Determine the Period and Amplitude Of $y = 5 \cos \left( \frac { x } { 13 } + \frac { \pi } { 5 } \right)$

question 40

Multiple Choice

Determine the period and amplitude of $y = 5 \cos \left( \frac { x } { 13 } + \frac { \pi } { 5 } \right)$ .

• A) period: \(\frac { 2 \pi } { 13 }\); amplitude: 5
• B) period: \(26 \pi\); amplitude: 5
• C) period: \(13 \pi\); amplitude: 10
• D) period: \(\frac { \pi } { 13 }\); amplitude: 5
• E) period: \(- \frac { 2 \pi } { 13 } ;\) amplitude: \(- 5\)