14.7 EVALUATION OF REAL DEFINITE INTEGRALS
We shall now discuss the application of Cauchy's Residue theorem to evaluate real definite integrals.
(A) Integration around the unit circle
We consider the integrals of the type
where the integrand is a rational function of sin θ and cos θ. Substitutet z = eiθ. Then, dz = i eiθ dθ = iz dθ and
Thus (47) converts inZto the integral
where φ(z) is a rational function of z and C is the unit circle ...
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