+++ /dev/null
-coefficient(1): a
-
-integrate (y'') -> -y':
- IC: +1
-integrate (-y') -> y
-invert (y) -> -y
-sin = y
-
-integrate (omega') -> -omega
-a * sin -> a_times_sin
-omega' = a_times_sin
-
-invert (-omega) -> omega
-multiply (omega, omega) -> omega²
-multiply (omega², -y) -> -omega²y
-y'' = -omega²y