Solve the Initial-Value Problem $$y ^ { tt } + 81 y = 0 , y \left( \frac { \pi } { 9 } \right) = 0 , y ^ {t } \left( \frac { \pi } { 9 } \right) = 4$$

question 8

Short Answer

Solve the initial-value problem.
$$y ^ { tt } + 81 y = 0 , y \left( \frac { \pi } { 9 } \right) = 0 , y ^ {t } \left( \frac { \pi } { 9 } \right) = 4$$

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