Solve the initial-value problem.
$$y ^ { tt } + 81 y = 0 , y \left( \frac { \pi } { 9 } \right) = 0 , y ^ { t } \left( \frac { \pi } { 9 } \right) = 6$$

Name: Solve the initial-value problem. \[y ^ { tt } + 81 y = 0 , y \left( \frac { \pi } { 9 } \right) = 0 , y ^ { t } \left( \frac { \pi } { 9 } \right) = 6\]
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The Answer of Solve the initial-value problem.
$$y ^ { tt } + 81 y = 0 , y \left( \frac { \pi } { 9 } \right) = 0 , y ^ { t } \left( \frac { \pi } { 9 } \right) = 6$$

Solve the Initial-Value Problem ytt+81y=0,y(π9)=0,yt(π9)=6y ^ { tt } + 81 y = 0 , y \left( \frac { \pi } { 9 } \right) = 0 , y ^ { t } \left( \frac { \pi } { 9 } \right) = 6ytt+81y=0,y(9π​)=0,yt(9π​)=6

Solve the Initial-Value Problem $y ^ { tt } + 81 y = 0 , y \left( \frac { \pi } { 9 } \right) = 0 , y ^ { t } \left( \frac { \pi } { 9 } \right) = 6$