Gamma function calculator and/or plotter
Other special functions.
distance between point and line, point and plane, line and plane, 2D/3D, etc.
rule of 3
interest calculator
amortization
summation
product (finite/infinite)
combination (binomial coefficients), permutation
Detailed solution of quadratic equation.
Polynomial long division
recursion
regular polygon (area, perimeter, inradius, circumradius)
circle segment
ellipse: given foci or given radii or given equation
Hyperbola
Conic calculator (given equation, type, foci, etc)
Taylor series of a function
Continued fraction expansion of a function
Polynomial interpolation
Bezier
Special polynomials: Legendre, Chebyshev, Hermite, Laguerre

