Furter Pure

Question 1

Sum of roots of unity

Answer 1

0

Question 2

Component of a in direction b

Answer 2

((a.b)/(b.b)).b

Question 3

Area segment

Answer 3

1/2 r^2 (x - sinx)

Question 4

Cos^n(theta)

In z form
z=e^itheta

Answer 4

(1/2 (z + 1/z) )^n

Question 5

Sin^n (theta)

In z form (de moives)

Answer 5

( 1/2i (z - 1/z) )^n