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Could some one help me with this mathematical induction question 2n^3-2n is divisible by 12 for integers n> and equal to 1

C = 1 + cos x + cos 2x +..... + cos (n-1)x S= sinx+sin2x+sin3x....+sin(n-1)x. i) Multiply series S by i ...... did this Ok ii) Write down C+iS ...did this Ok iii) If z=cosx+isinx, use de moivres to express c+is as a series in terms of z. .....did this Ok iv) Hence show that C + iS = (1-z^n)/...

i have a difficult complex no question can someone help out there please