Content-Type: application/json (POST)

https://7one.ir/api/free/calculator.php?expr=2+3*4&mode=simple

POST https://7one.ir/api/free/calculator.php
Content-Type: application/json

{"expression":"sin(30)","mode":"engineering","angle":"deg"}

{
  "success": true,
  "expression": "2+3*4",
  "result": 14,
  "formatted": "14",
  "mode": "simple"
}

• پارامتر expr یا expression — عبارت محاسباتی
• mode: simple · engineering
• angle: deg · rad (حالت مهندسی)
• توابع مهندسی: sin · cos · tan · log · ln · sqrt · ^ · ! · pi · e