+0  
 
+1
50
1
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The number \(\text{cis } 75^\circ + \text{cis } 83^\circ + \text{cis } 91^\circ + \dots + \text{cis } 147^\circ\) is expressed in the form \(r \, \text{cis } \theta\), where \(0 \le \theta < 360^\circ\). Find \(\theta\) in degrees.

 Dec 20, 2019
 #1
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0

The sum works out to -2.38495 + 8.900753, which corresponds to an angle of theta = 105 degrees.

 Dec 20, 2019

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