Сomputer algebra

To solve this Arithmetic progression request, which requires a simple single line of code calculator, I decided to make a universal calculator, which can derive remained parameters automatically from the input data and related formulas.
It's a little bit complicated but powerful enough to derive the solution from any formulas containing arithmetic operations automatically: +, -, /, * , ^ and function: sin, arcsin, cos, arccos, tan, arctan, cot, arccot, cosec, arccosec, sec, arcsec, sh, arsh, ch, arch, th, tanh, arth, cth, coth, arcth, sech, arsech, csch, arcsch, exp, ln.
Just enter input data and related formulas in the text field and get a solution for remained unknown parameters.

Universal problem solver

Sn=n*(a+Tn)/2 Sn=n*(2*a+(n-1)*d)/2 a=8 Tn=33 Sn=123

Formulas and input data

Enter a formula or data value on every new line

Calculation precision

Digits after the decimal point: 2

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Input data

Name	Value
a	8
Tn	33
Sn	123
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Formula

#	Formula
1	$Sn=\frac{{n}\cdot({a}+{Tn})}{{2}}$
2	$Sn=\frac{{n}\cdot({2}\cdot{a}+({n}-{1})\cdot{d})}{{2}}$
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Results

Variable	Result	Formula
n	6	$n=\frac{{Sn}}{{0.5}\cdot{a}+{0.5}\cdot{Tn}}$
d	5	$d=\frac{{Sn}-{a}\cdot{n}}{{0.5}\cdot{n}\cdot({n}-{1})}$
Items per page: 5102050100200500100010K100KAll 1 - 2 of 2

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The calculator recognizes two special constants - pi = 3.1415926... and e = 2.718....
If something fails to work as you expect it, just let me know in the comments.