Løs y′′+y=0, y(0)=0, y′(0)=1y''+y=0,\ y(0)=0,\ y'(0)=1y′′+y=0, y(0)=0, y′(0)=1.
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(s2Y−1)+Y=0⇒Y=1s2+1⇒y=sint(s^2Y-1)+Y=0\Rightarrow Y=\dfrac{1}{s^2+1}\Rightarrow y=\sin t(s2Y−1)+Y=0⇒Y=s2+11⇒y=sint.
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