How do I use dsolve to find the solution to u'' + u = 3cos(wt) , u(0) = 0, u'(0) = 0 ?

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Dinakar Chappa 2017-3-24

回答： Walter Roberson 2017-3-24

I want to say my problem is me having trouble entering the u'' and the constant w, but I am lost in general as I am fairly new to MatLab.

syms u w t 
eqn = diff(diff(u)) + u == 3* cos(w*t)
dsolve(eqn)

Walter Roberson 2017-3-24

syms u(t) w
du = diff(u);
eqn = diff(du) + u == 3* cos(w*t)
dsolve(eqn, u(0) == 0, du(0) == 0)

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