Gan- can find out error

Gan calculator can find out error in formula.
Our calculator support: long formula, history, support iPad, can change formula when it has result, support no web in use, can find out error in formula.
Our calculator has error correction ability. We can point out the location of errors. Perfectly solve the problem of whether the value of 6÷2(1+2) is 1 or 9, it will find out the '(' maybe cause error. 
It's easy to use. Whatever you input, you can get the result directly from a formula.
It supports moving the cursor, inserting numbers and modifying formulas at will.
Simple request: When you look the result, don't look wrong number. Such as look 332 to 322, in fact it is 332.Then leave other things to our calculator will be well done.