23.1 Solve the integral equation
for the function y = y(x) for x > 0. Note that for x < 0, y(x) can be chosen as is most convenient.
Since cos uv is an even function of v, we will make y(−v) = y(v) so that the complete integrand is also an even function of v. The integral I on the LHS can then be written as
the last step following ...