Returns the difference between two complex numbers.

**Sample Usage**

IMSUB("3+4i","1+2i")

IMSUB(C5, C6)

**Syntax**

IMSUB(complex_number1, complex_number2)

- complex_number1 - The first complex number, from which to subtract complex_number2.
- complex_number2 - The second complex number, to subtract from complex_number1.

**Examples**

IMSUB("3+4i","1+2i") returns a value of "2+2i".

IMSUB(C5,C6) returns the difference between the complex numbers contained in the two cells: C5 and C6.

**Notes**

- The difference between two complex numbers is:
- (a+bi) - (c+di) = (a-c) + (b-d)i

- You can subtract two complex numbers only if they have the same suffix (i or j).