Discussion
After the cosine transformation, the vortex sheet strength in thin airfoil theory is written as
Answer: B
The strength is written as a leading term carrying a cotangent of half the angle, which supplies the correct inverse-square-root singularity at the leading edge, plus a sine series whose terms all vanish at the trailing edge. The form therefore satisfies the Kutta condition automatically whatever the coefficients turn out to be.
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