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References to 'quadrant'
1. $\operatorname{arc tan}$ with two arguments by matte
2. area bounded by arc and two lines by pahio
3. Cassini oval by pahio
4. convex subgroup by CWoo
5. counter-example of Fubini's theorem for the Lebesgue integral by rmilson
6. derivation of half-angle formulae for tangent by rspuzio
7. determining signs of trigonometric functions by Wkbj79
8. exact trigonometry tables by stevecheng
9. examples of Gaussian primes by PrimeFan
10. geometric derivation of addition formulas for sine and cosine by rm50
11. geometric proof of Pythagorean triplet by rm50
12. hyperbola by pahio
13. Laplace transform of convolution by pahio
14. Motzkin number by PrimeFan
15. proof of Jordan's Inequality by mathcam
16. Schwarz-Christoffel transformation by pahio
17. spectral sequence by alozano
18. tangent of halved angle by pahio
19. trigonometry by rm50