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(2+omega+omega^2)^3+(1+omega-omega^2)^3=...

`(2+omega+omega^2)^3+(1+omega-omega^2)^3=(1-3omega+omega^2)^4=1`

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If omega be a complex cube root of unity,then the number (1-omega-omega^(2))^(3)+(omega-1-omega^(2))^(3)+(omega^(2)-omega-1)^(3) is: a.Divisible by 3 but not by 8 b.Divisible by 8 but not by 3 c.Divisible by both 3 & 8 d.none of these

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A DAS GUPTA-COMPLEX NUMBERS-EXERCISE
  1. If z^7+1 =0 then cos(pi/7) cos((3pi)/7) cos((5pi)/7) is (A) 1/8 ...

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  2. Hence deduce that cos(pi)/(9)cos(2 pi)/(9)cos(3 pi)/(9)cos(4 pi)/(9)=(...

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  3. (2+omega+omega^2)^3+(1+omega-omega^2)^3=(1-3omega+omega^2)^4=1

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  4. (i) If alpha,beta be the imaginary cube root of unity, then show that ...

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  5. If x=a+b,y=aomega+bomega^2 nd z=omega^2+bomega, prove that x^3+y^3+z^3...

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  6. If x = a + b, y= aw + bw^2 and z = aw^2 + bw, where w is an imaginary ...

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  7. Prove that ((i+sqrt3)/2)^100+((i-sqrt3)/2)^100+1=0.

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  8. What is the value of ((i+sqrt3)/(-i+sqrt3))^(200)+((i-sqrt3)/(i+sqrt3)...

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  9. Prove that sqrt(-1-sqrt(-1-sqrt1-… prop=w or w^2 .

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  10. Resolve into the linear factor: a^3+b^3

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  11. Resolve into the linear factor: a^3+b^3+c^3-3abc

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  12. value of the series a(0)-a(2) + a(4)-a(6) +….. is

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  13. If (1+x)^n=a0+a1x+a2x^2+...+anx^n then find : a1-a3+a5-a7+… .

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  14. If (1+x)^n=a0+a1x+a2x^2+...+anx^n then find : a0+a3+a6+a9+… .

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  15. If (1+x+x^2)^n=a0+a1x+a2x^2++a(2n)x(2n), find the value of a0+a6++ ,n ...

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  16. If 1,a1,a2,a3,…,a(n-1) are the nth roots of unity then prove that : (1...

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  17. If 1,a1,a2,a3,…,a(n-1) are the nth roots of unity then prove that : 1+...

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  18. If alpha is an n^(th) roots of unity, then 1+2alpha+3alpha^(2)+……..+n...

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  19. If alpha (!=1) is a nth root of unity then S = 1 + 3alpha+ 5alpha^2 + ...

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  20. sum(p=1)^pi(3p+2)[sum(q=1)^10sin(2qpi)/11-icos(2qpi)/11]^p

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