Find the Period and Amplitude $$y = \frac { 4 } { 5 } \cos \frac { 4 x } { 5 }$$

question 31

Multiple Choice

Find the period and amplitude.​ $$y = \frac { 4 } { 5 } \cos \frac { 4 x } { 5 }$$ ​

• A)Period: 2π;Amplitude: 1
• B)Period: \(\frac { \pi } { 2 }\) ;Amplitude: \(\frac { 1 } { 5 }\)
• C)Period: π;Amplitude: \(\frac { 5 } { 4 }\)
• D)Period: π;Amplitude: 5
• E)Period: \(\frac { 5 \pi } { 2 }\) ;Amplitude: \(\frac { 4 } { 5 }\)

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