lilMissMindset
DIFFERENTIAL EQUATION:
help please, anybody.
(D^2 +4)y =4sin^2 (x)



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hartnn
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r^2 + 4 =0
r = \(\pm\)2i
no repeated root...so form will be a sin x+ b cos x

hartnn
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and not Acosx+Bsinx+Cxcosx+Dxsinx

lilMissMindset
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yes, i got the answer now. :D yay!

hartnn
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:D

hartnn
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i still wonder , how u got x in the answer..

lilMissMindset
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instead of using sin^2 x, i used 1/2  1/2*cos2x

hartnn
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ok, so form will be asin x + bcos x +cx ?

lilMissMindset
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yeps

hartnn
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:)