Find the Amplitude, Period and Phase Shift Of $y = - \frac { 5 } { 4 } \cos \left( 2 x - \frac { 4 \pi } { 3 } \right)$

Multiple Choice

Find the amplitude, period and phase shift of $y = - \frac { 5 } { 4 } \cos \left( 2 x - \frac { 4 \pi } { 3 } \right)$

A) amplitude: $\frac { 5 } { 4 }$ , period: $\pi$ , phase shift: $\frac { 2 \pi } { 3 }$ To the left

B) amplitude: $\frac { 5 } { 4 }$ , period: $2 \pi$ , phase shift: $\frac { 4 \pi } { 3 }$ To the right

C) amplitude: $- \frac { 5 } { 4 }$ , period: $\pi$ , phase shift: $\frac { 5 \pi } { 3 }$ To the left

D) amplitude: $- \frac { 5 } { 4 }$ , period: $2 \pi$ , phase shift: $\frac { 2 \pi } { 3 }$ To the right

E) amplitude: $\frac { 5 } { 4 }$ , period: $\pi$ , phase shift: $\frac { 2 \pi } { 3 }$ To the right