Laws of indices

Sonal7

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Oct 4, 2019
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I really don't understand the step where the pointer is. It's a method to work out sum of series. The denominator is just factorising out e^i pi/2n. The numerator is confusing to me.
 

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I got this one. Perseverance.
 

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I need to learn to just give it a few more mins before posting as I often the solution appears in my head!...which is nice.
 
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