Another way to express <mtext>cis&#xA0;</mtext> 75 &#x2218;<!-- ∘ --> </msup>

Hailie Blevins 2022-06-25 Answered
Another way to express cis  75 + cis  83 + cis  91 + + cis  147
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robegarj
Answered 2022-06-26 Author has 24 answers
HINT:
By How to prove Euler's formula: e i t = cos t + i sin t? ( t ) = e i t ,,
we need
r = 0 9 ( e i ) ( 75 + 8 r ) = r = 0 9 e 75 i ( e 8 i ) r
which is in Geometric progression.

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