Equation solving
Input
solve equation(x^2-5*x+6)Result
x1=3
x2=2ATC 2.1.8
Advanced Trigonometry Calculator 2.1.8 - Open-Source Mathematical Computing
Official site for Advanced Trigonometry Calculator 2.1.8, an open-source C/C++ mathematical computing engine and Windows application with documentation, downloads, examples, and ATC Online Alpha.
ATC 2.1.8 documentation hub
Open-source mathematical computing for Windows.
Advanced Trigonometry Calculator is a C/C++ mathematical engine and Windows desktop application created in 2011 and maintained by Renato Alexandre dos Santos Freitas. It supports practical numerical workflows, implemented symbolic/numeric tools, scripting, and batch TXT processing.
2.1.8Current documentation focus
2011Project created
GPLv3Open-source license
C/C++Core Windows engine
Equation and polynomial workflowsSolve supported equations, simplify polynomial expressions, and build polynomials from roots.
Scientific computationTrigonometry, complex numbers, matrices, statistics, physics, geometry, unit conversions, DSP and FFT.
Command ReferenceA practical index of documented ATC command patterns grouped by topic.
Automation and scriptingRun repeatable TXT workflows, script examples, and reusable user functions.
Real commands
ATC in action
Three compact examples from the documented ATC 2.1.8 command set.
Linear system
Input
solve equations system(1\1\5;1\_1\1)Result
x1=3
x2=2DSP / FFT
Input
fft(1\0\0\0)Result
four FFT bins equal to 1ATC 2.1.8 Highlights
- Solver correctness.
- Settings robustness.
- Cross-version x86 compatibility.
- Precision-mode persistence.
- Equation and polynomial fixes.
- Broader regression coverage.
- Windows console behavior.
- Memory improvements.
- Command-line editing.
- Clearer verbose-resolution output.
Previous release: ATC 2.1.7.
Professional Scope
ATC is a focused numerical and implemented symbolic/numeric mathematical tool. It is not a universal CAS and it should not replace domain-specific validation tools for critical decisions.
New in 2.1.8
The 2.1.8 refresh focuses on solver correctness, settings robustness, precision-mode persistence, polynomial and equation fixes, command-line editing, and documentation clarity.