one way:
cos 75 + cos 83 + .....cos 147 = a
sin 75 + sin 83 + .... sin 147 = b
tan theta = b/a
r = sqrt (a^2+b^2)
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.
I need help.
6 answers
I don't understand?
calculate a above.
calculate b above.
theta= arctan (b/a)
calculate b above.
theta= arctan (b/a)
How do I calculate a and b?
I got 291 degrees. is that correct?
nvm its 111