For the Simple Harmonic Motion Described by the Trigonometric Function,find $$d = 6 \cos \frac { 6 \pi } { 5 } t$$

Multiple Choice

For the simple harmonic motion described by the trigonometric function,find the maximumvalue of d when .? $$d = 6 \cos \frac { 6 \pi } { 5 } t$$ Round your answer to nearest whole number. ?

A) 1
B) 10
C) 6
D) 5
E) 0