The first mode is, as always, degree or radian. If not in degree mode, you need to add the degree symbol, i.e. . Note the key, the 2 nd of EE in the first column. Option 2 is less intuitive, but involves a lot less button-punching. Regardless of the mode or format, the machine won't put a complex number into simple trig form.
Some interpretation is required.
It is your job to rewrite your calculator's spew in the proper form, . You can, of course, use for 45 . If you are in polar radian mode, you get .Note that . The right mode for this problem is rectangular.