Dont understand mark scheme
I don’t understand how they multiply it by (cos9x+isin9x)/(cos9x-isin9x) and not both being minus. Wouldn’t this change the number because it’s not multiplying by one?
I don’t understand how they multiply it by (cos9x+isin9x)/(cos9x-isin9x) and not both being minus. Wouldn’t this change the number because it’s not multiplying by one?