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Hello,

I am a little bit confused.. Is the following equations linear or non linear:

(dy/dt)^2+2y(t) = x(t).

(here i don't know if (d^2y/dt^2) = (dy/dt)^2 ,if this is true then i know it's linear)

dy/dt +(sin(t))y(t) = dx/dt +2x(t)

(does having derivative of x in the R.H.S make this equation non linear)

y(t) = Sx(T)dT

('S' means integrated from -infinity to 't', 'T' means (tao)) i am thinking this is linear...

Thanks in advance.

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# Is this equation linear or nonlinear?

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