1. What is an Expression Calculator?

An Expression Calculator evaluates mathematical expressions entered by the user. It can handle basic arithmetic as well as more complex mathematical operations and functions.

2. How Does the Calculator Work?

The calculator parses and evaluates mathematical expressions:

Where the expression can include:

• Basic arithmetic: +, -, *, /
• Exponents: ^ or **
• Parentheses for grouping
• Mathematical functions

3. Supported Operations

Details: The calculator supports basic arithmetic, trigonometric functions (sin, cos, tan), logarithms, constants (pi, e), and more complex operations.

4. Using the Calculator

Tips: Enter any valid mathematical expression. Use parentheses to clarify order of operations. Example expressions: "2+3*5", "sin(pi/2)", "(2^3 + 5)/4".

5. Frequently Asked Questions (FAQ)

Q1: What operations are supported?
A: Basic arithmetic, exponents, trigonometric functions, logarithms, and more.

Q2: What's the order of operations?
A: Standard PEMDAS order (Parentheses, Exponents, Multiplication/Division, Addition/Subtraction).

Q3: Can I use variables?
A: This basic version doesn't support variables - only direct evaluation of expressions.

Q4: What functions are available?
A: Common math functions like sin, cos, tan, log, sqrt, abs, etc.

Q5: How precise are the calculations?
A: Calculations use PHP's floating-point precision (typically about 14 decimal digits).