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state the order and linearity of the diff eq[/SIZE]

(d^2u/dr^2)+(du/dr)+(u)=cos(r+u)

1)the order is the second order. since the highest derivative is 2

2) the term cos(r+u) is not linear therefore this equation is not linear.

is my reasoning for 2) right since the dependent variable is contain in cos(r+u) that makes this non-linear, right?

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# Homework Help: Basic Differential Equation Can you check my work?

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