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Find the real values of theta for which ...

Find the real values of `theta` for which the complex number `(1+i costheta)/(1-2i costheta)` is purely real.

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RD SHARMA ENGLISH-COMPLEX NUMBERS-All Questions
  1. If x+i y=(a+i b)/(a-i b) prove that x^2+y^2=1

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  2. Write the least positive integral value of n for which ((1+i)/(1-i))^n...

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  3. Find the real values of theta for which the complex number (1+i costhe...

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  4. Find the smallest positive integer value of n for which ((1+i)^n)/((1-...

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  5. If ((1+i)/(1-i))^3-((1-i)/(1+i))^3=x+i y ,\ fin d\ (x , y)

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  6. If ((1-i)/(1+i))^(100)=a+ i b , find (a , b)

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  7. Evaluate the following: 2x^3+2x^2-7x+72 ,\ w h e n\ x=(3-5i)/2

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  8. Evaluate x^4-4x^3 + 4x^2 + 8x + 44, when x = 3 + 2i

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  9. Evaluate the following:\ x^4+4x^3+6x^2+4x+9,\ w h e n\ x=-1+isqrt(2)

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  10. Evaluate the following: x^6+x^4+x^2+1,\ w h e n\ x=(1+i)/(sqrt(2))

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  11. Evaluate the following: \ 2x^4+5x^3+7x^2-x+41 ,\ w h e n\ x=-2-sqrt(3)...

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  12. If z1 is a complex number other than -1 such that |z1|=1\ a n d\ z2=(z...

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  13. Solve the system of equations R e(z^2)=0,\ |z|=2

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  14. If |z+1|=z+2(1+i), find zdot

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  15. Find the square root of the following complex number: -5+12 i

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  16. Find the square roots of the following:8i

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  17. Find the square root of the following complex number: \ 1+4sqrt(-3)

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  18. Find the square root of the following complex number: -7-24 i

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  19. Find square root of 8-15 i

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  20. Find the square root of the following complex number: 1-i

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