http://m.imgur.com/SeuqmHu
Idk what to do for the first one
For the second, I used sum of gp, but couldn't get the answer.
Answers are 16root2(cos^4(pi/16)) and (1+root2)i respectively
*edit - for the second q, mistakenly took n to be 20 instead of 21.
Idk what to do for the first one
For the second, I used sum of gp, but couldn't get the answer.
Answers are 16root2(cos^4(pi/16)) and (1+root2)i respectively
*edit - for the second q, mistakenly took n to be 20 instead of 21.
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