Posted by **raven** on Sunday, July 31, 2011 at 5:18pm.

find the standard form of the complex numbers 5/4 (cos 225degree + isin 225degree)

- precal 2 -
**Henry**, Sunday, July 31, 2011 at 9:49pm
5/4(cos225 + isin225) =

1.25(-0.7071 - i0.7071) =

-0.8839 - i0.8839 =

tanA = -0.8839 / -0.8839 = 1,

A = 45 deg. = 45 + 180 = 225 deg, Q3.

Since the X and Y components are neg,

our resultant vector is in Q3.

r = -0.8839 / cos45 = -1.25 @ 225 deg,

Q3.

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