Consider the equation utt = c 2uxx for 0 < x < l, with the boundary conditions ux(0, t) = 0, u(l, t) = 0. (a) Find all eigenfunctions. (The answer is cos[(n + 1 2 )πx/l], which n?) (b) Write the series expansion for a solution u(x, t) in terms of the initial data and (·, ·)L2 .

answer:      

step-by-step explanation:

these sign is used to tell weather the number is greater or less than the number   <   or >     but this sign means its equal =    

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step-by-step explanation:

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

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plug in the numbers into the variables

your answer is a

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step-by-step explanation: