What is the solution for y^{''}+21y=0 ?

The solution for y^{''}+21y=0 is y=c_{1}cos(sqrt(21)t)+c_{2}sin(sqrt(21)t)

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y^{''}+21y=0

y^{^{''}} + 21 y = 0

y = c_{1} cos (21 t) + c_{2} sin (21 t)

Solution steps

y^{''} (t) + 21 y = 0

Solve linear ODE:

y = c_{1} cos (21 t) + c_{2} sin (21 t)

y = c_{1} cos (21 t) + c_{2} sin (21 t)

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x \to \infty lim ((1 + \frac{n + 3}{4 n + 1})^{2 n})

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\int_{0}^{\frac{π}{2}} - 4 cos^{5} (x) d x

What is the solution for y^{''}+21y=0 ?
The solution for y^{''}+21y=0 is y=c_{1}cos(sqrt(21)t)+c_{2}sin(sqrt(21)t)