Question: how do i solve differential equation in maple?

Hello everyone, can anyone help me to solve this problem? noted I want to solve a couple of odes and need to find involved integration constant i.e c1 to c4. 
 

restart

diff(q(y), y, y)-A*q(y) = B*(P*y+c1)

diff(diff(q(y), y), y)-A*q(y) = B*(P*y+c1)

(1)

NULL

bc := q(-sigma) = 0, q(sigma) = 0

q(-sigma) = 0, q(sigma) = 0

(2)

(1+N)*(diff(u(y), y, y))+N*(diff(q(y), y)) = P

(1+N)*(diff(diff(u(y), y), y))+N*(diff(q(y), y)) = P

(3)

bc := u(-sigma) = 1, u(sigma) = -k

u(-sigma) = 1, u(sigma) = -k

(4)

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Download help_couple_ode.mw

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