y two strokes of the second (2nd) order minus 6y stroke first (1st) order plus 25y equally 2sen(t divide by 2) minus co sinus of e of (t divide by 2)
y two strokes of the second (2nd) order minus 6y stroke first (1st) order plus two 5y equally two sen(t divide by 2) minus co sinus of e of (t divide by 2)
y''-6y'+25y=2sent/2-cost/2
y''-6y'+25y=2sen(t divide by 2)-cos(t divide by 2)