Find the Period P, Amplitude A, and Phase Shift S $y = 3 \cos \left( \frac { 3 } { 4 } x - 90 ^ { \circ } \right)$

question 13

Multiple Choice

Find the period P, amplitude A, and phase shift S, and graph at least two periods of the equation. $y = 3 \cos \left( \frac { 3 } { 4 } x - 90 ^ { \circ } \right)$

• A) P = 480°, A = 3, S = -120°
• B) P = 480°, A = 3, S = 120°
• C) P = 120°, A = 0.75, S = -30°
• D) P = 120°, A = 0.75, S = -30°
• E) P = 480°, A = 3, S = -120°

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