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: f''+f'+2sin2xsinx=0 >
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Timmy_pro
f''+f'+2sin2xsinx=0
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.
Evgeny


f''+f'= -2sin2xsinx,

.

cos(x-y)=cosx*cosy+sinx*siny
cos(x+y)=cosx*cosy-sinx*siny

sinx*siny

Timmy_pro
, 2sin2xsinx = cosX-cos3x, .
Evgeny
(Timmy_pro @ 8.12.2009, 20:35) *

, 2sin2xsinx = cosX-cos3x, .

F = F1 + F2,
F1 F2 -

f'' + f' = cos(3x)
f'' + f' = -cos(x)

F1 = A1*cos(3x)+B1*sin(3x)
F2 = A2*cos(x)+B2*sin(x)
tig81
Timmy_pro
... .
tig81
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