Tangent Line Calculator A simple web app that calculates the equation of a tangent line of a function at a given point. Pell's Equation Solver Find the first # of smallest positive integer pairs (x, y) that satisfy Pell's equation: x^2 - n * y^2 = 1. Reciprocal Equation Solver Find all unique positive integer solutions to a reciprocal equation of the form 1/x_1 + 1/x_2 + ... + 1/x_n = k. Sequence Polynomial Finder Calculate the lowest-degree polynomial function that passes through a given sequence of numbers or points. Pythagorean Finder Determine all distinct Pythagorean triplets given a known side. Integer Triangle Finder Find unique scalene integral triangles (60 or 120 degrees) with a given side length. Trigonometric Function Grapher Step-by-step graphing of trigonometric functions with visual explanations.