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Mathematics 16 Online
OpenStudy (anonymous):

x''+x=sect ; x(0)=1, x'(0)=2

OpenStudy (anonymous):

\[r^2 + 1 = 0\] \[r=+/- i\] \[x _{h}(t)=c _{1}cost+c _{2}sint\]

OpenStudy (anonymous):

I am having trouble with the sect part

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