A complex approach to integral of cardinal sine
3704
Evaluating the integral $\int_0^\infty \frac{\sin x} x \,\mathrm dx = \frac \pi 2$?
19778
Integrating squared absolute value of a complex sequence
153283
Trigonometric Integral Using Residue Theorem
135447
Compute the integral $\int_0^{\frac\pi2}\frac{\mathrm d \theta}{\sqrt{\sin \theta}}$
100559
Gaussian integral with a shift in the complex plane
83359
Complex number identity by trigonometry
127284
Closed form of $\int_0^{\pi/2} \frac{\arctan^2 (\sin^2 \theta)}{\sin^2 \theta}\,d\theta$
15625
Computing $\int_0^\infty\mathrm{d} x\frac{x}{e^x+1}$ with contour integration
145183
finding $\int_0^\infty \dfrac{dx}{1+x^4}$ through complex analysis
62471
Homework: Complex integral equation
152339
Complex-valued Fourier integral: $ \int_{ - \infty }^{ + \infty } {\frac{{\cos (ax)}}{{{x^2} + 1}}{e^{ - ibx}}\,\mathrm dx} $
23685
Integrating $\int \sin^n{x} \ dx$
101587
Calculating $\int_{- \infty}^{\infty} \frac{\sin x \,dx}{x+i} $
12604
Evaluate $\int_0^\pi xf(\sin x)dx$
36400
Finding singularities of a complex function and the respective residues
18836
Complex integral over a circle
62109
$\int_{-\infty}^{\infty} \frac{\cos(αx)}{(x^2+1)(x^2+4)} \mathrm dx$ using Complex methods