Asked by Josh

The number cis 75 + cis 83 + cis91 +...+ cis 147 is expressed in the form r cis(theta), where 0 <= theta < 360.
Find theta in degrees.

@Damon I didn't understand your reply to my post. Could you please explain it to me?
Answered by bobpursley
see the previous post with Damon's response.

calculate a above.
calculate b above.

theta= arctan (b/a)
Answered by bobpursley
http://www.jiskha.com/display.cgi?id=1408819018
Answered by Josh
How do I calculate a and b?
Answered by Damon
Use your calculator
cos 75 =
cos 83 =
cos 91 =
cos 99 =
cos 107 =
cos 115 =
cos 123 =
cos 131 =
cos 139 -
cos 147 =
now add to get a :)
Answered by no one
bruh you can't use a calculator for these problems that defeats the purpose
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