The equations calculator online (equation solver) contains the section:

This calculator return only anwser, but return ✪ detail step by step solution ✪ for
[✔] A quadratic equations
[✔] A simplest trigonometric equations
[✔] A equation with a module (for example, |x + 1| + |x^2 – 7| = 20)

The Supported:
[✔] Supported all math symbols and functions. For example: sin(x), cos(x), exp(x), tan(x), ctan(x) and other.
[✔] Suported complex variables (solve complex equations)

Solve any equation types, such as:
[✔] linear equations
[✔] square (quatratic) and cubic equations
[✔] polynomial equations
[✔] trigonometric equations
[✔] exponential equations
[✔] logarithmic equations
[✔] equations with complex numbers
[✔] and other

The Calculator contain several features:
[✔] Numeric solutions for unsolvable equations (such as cos(x) = x^3 - x + 2)
[✔] Several examples
[✔] Сorrect input expression errors (for example, you enter x^2-x+1/x - 1=0 or e^-x^2=5)