Author name: Daniel Sir

Free online inverse trig calculator — enter a value and instantly get arcsin, arccos or arctan in both degrees and radians, within the correct principal value range.

Free online Cramer’s Rule calculator — solve a 2×2 or 3×3 system of linear equations using determinants, with every step shown.

Free online matrix rank calculator — enter a 2×2 or 3×3 matrix and instantly find its rank via row reduction.

Free online limit calculator — evaluate the limit of a polynomial as x approaches a value, with the substitution shown step by step.

Free online calculator for the perpendicular distance from a point to a line — enter the line’s equation and a point, get the distance instantly.

Free online conic section calculator — get the standard equation, focus, and key properties for a parabola, ellipse or hyperbola from your inputs.

Free online linear inequality solver — enter ax + b [inequality] c and instantly get the solution set, with the sign-flip rule applied automatically when needed.

Free online discriminant calculator — enter a, b, c and instantly see the discriminant value and what it tells you about the nature of the roots.

Free online domain and range calculator — enter a function type (rational, square root, or polynomial) and instantly see its domain and range with the reasoning shown.