cos(1)+cos(2)+...+cos(n)

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Hi,

In this video I'll be evaluating cos(1)+cos(2)+...+cos(n). I'll be skipping over the algebraic details and instead I'll just focus on the tricks that matter in order to evaluate this sum.

Follow me on Instagram: @jpimaths

And, as always, any comments, feedback or suggestions are welcomed!

Thanks.
  1. J Pi Maths
  2. cos(1) cos(2) ...cos(n)
  3. complex numbers
  4. eulers formula
  5. summation
  6. real part
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