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Find the Period and Amplitude y=45cos⁡4x5y = \frac { 4 } { 5 } \cos \frac { 4 x } { 5 }

question 287

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Find the period and amplitude.
y=45cos⁡4x5y = \frac { 4 } { 5 } \cos \frac { 4 x } { 5 }

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