二十、Consider the following boundary value problem for the bivariate function u(x,t) defined
for 0 ≤x≤π and t≥0

Given the end-point and initial conditions
=0 and u(x,0)=x(π-x)
which of the following statements is/are true for the solution u(x,t) when it is expressed
 as
for some constants
(A)
(B) a₁=-1.
(C) p₂ =-31.
(D) b₁ =-1
(E) None of the above are true.

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