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References to 'addition formula'
1. addition and subtraction formulas for hyperbolic functions by Wkbj79
2. angle multiplication and division formulae for tangent by rspuzio
3. application of fundamental theorem of integral calculus by pahio
4. area functions by pahio
5. argument of product and quotient by pahio
6. Bessel's equation by pahio
7. complex exponential function by pahio
8. complex sine and cosine by pahio
9. complex tangent and cotangent by pahio
10. convexity of tangent function by rspuzio
11. example of finding catacaustic by pahio
12. example of solving a functional equation by pahio
13. exponential function never vanishes by pahio
14. hyperbolic functions by mathwizard
15. quasiperiod and half quasiperiod relations for Jacobi $\vartheta$ functions by rspuzio
16. rigorous definition of tangent function by rspuzio
17. topic entry on complex analysis by pahio
18. trigonometric formulas from series by pahio
19. Weierstrass' theorem on addition formulas by rspuzio