A---> 10 - j15

15/10

arc tan 3/2 = -56,51

here is the model of my calculator:
http://www.f-bert.net/outset/casio/casio_cfx-9850g.jpg

copy link to address bar if, unclickable

I asked this question before and someone told me to press -3/2 to get -1.5 and then I should press the yellow (shift) button and then press tan-1 or tan button to get the answer but all i get is a "syn ERROR"