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If 1/(a+omega)+1/(b+omega)+1/(c+omega)+...

If `1/(a+omega)+1/(b+omega)+1/(c+omega)+1/(d+omega)=1/omega` where `a,b,c,d in R and omega` is cube root of unity then show that `sum 1/(a^2-a+1)=1`.

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FIITJEE-COMPLEX NUMBER-SOLVED PROBLEMS (SUBJECTIVE)
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  9. z1,z2,z3 are complex number and p,q,r are real numbers such that: p/(|...

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  10. Show that the equation a z^3+b z^2+ b z+ a =0 has a root alpha such...

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  11. If 1/(a+omega)+1/(b+omega)+1/(c+omega)+1/(d+omega)=1/omega where a,b...

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  13. 1 1^(n+2)+1 2^(2n+1) is divisible by 133.

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  14. Using mathematical induction , show that (-(1)/(2^2))(1-(2)/(3^2))(1-(...

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  15. Show that H1 + H2 +…....+H(n) = (n+1)H(n) - n. where H(n) = 1 + (1)/(2...

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  17. Show that 1+2x + 3x^2 +….+ nx^(n-1) = (1-(n+1)x^(n) + nx^(n+1))/((1-x)...

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  18. Find the sum tan^-1 x/ (1+1.2x^2)+tan^-1, x/(1+2.3x^2)+…+tan^-1, x/(1+...

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  19. Prove by mathematical induction that sum(r=0)^(n)r^(n)C(r)=n.2^(n-1), ...

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  20. Show that (d^n)/(dx^(n) )(x^(n) log x) = n! (log x + 1+(1)/(2) +…+(1)/...

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