2. Solve the following differential equation. sec(x)u" (x)+u'(x) = −1, u'(0) = 1, u(0) = 2. [Hint: use the substitution y = u'.] 1. (a) (b) Solve the following differential equations. y=ee, y(0) = 1 x²u'(x)+2xu(x)-x³- 2x² = 0, u(0) = 1. ==

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