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Find the values of following expression:`1+i^2+i^4+i^6+i^8+doti^(20)`

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RD SHARMA ENGLISH-COMPLEX NUMBERS-All Questions
  1. Prove that the following complex number is purely real: (i)((2+3i)/(3+...

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  2. Show that 1+i^(10)+i^(20)+i^(30) is a real number.

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  3. Find the values of following expression:1+i^2+i^4+i^6+i^8+doti^(20)

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  4. If (a+i b)(c+i d)(e+if)(g+i h)=A+i B prove that (a^2+b^2)(c^2+d^2)(e...

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  5. If z1, z2 are complex number such that (2z1)/(3z2) is purely imaginary...

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  6. If x=-5+2sqrt(-4) , find the value of x^4+9x^3+35 x^2-x+4.

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  7. If z is a complex number such that |z|=1, prove that (z-1)/(z+1) is pu...

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  8. If z=x+i y and w=(1-i z)/(z-i) , show that |w|=1 z is purely real.

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  9. If z=2-3i show that z^2-4z+13=0 and hence find the value of 4z^3-3z^...

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  10. If |z1|=|z2|=.......=|zn|=1, prove that |z1+z2+z3++zn|=1/(z1)+1/(z2)+...

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  11. Find the non-zero complex numbers z satisfying barz =i z^2dot

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  12. Show that if iz^3+z^2-z+i=0, then |z|=1

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  13. Solve the equation z^2 +|z|=0 , where z is a complex number.

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  14. If z1, z2a n dz3, z4 are two pairs of conjugate complex numbers, find ...

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  15. If zr=cos(pi/(3^r))+isin(pi/(3^r)),r=1,2,3, , prove that z1z2z3 zoo=i...

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  16. If xn=cospi/(2^n)+isinpi/(2^n) , prove that x1x2x3 xoo=-1.

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  17. Find the square root of the following: 5+12 i

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  18. Find the square roots of -15-8idot

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  19. Find the number of solutions of z^2+|z|^2=0.

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  20. If ((a^2+1)/(2a-i))^2=x+i y , find the value of x^2+y^2dot

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