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1.Express in the form of A+iB
a) ((1+2i)/(1+i))n for n = ±1, ±2, ±3, ±4………..
b) ln(1+itan α)
2.Find the sqrt of
a) x+ sqrt (-x4-x2-1)
3.Find the integral solutions of the equations
a) (1-i)n=2n
4.If 1 ω, ω2 are the three cube roots of the unity then, prove that
a) (a+b ω+c ω2)3+(a+b ω2+c ω)3= (2a-b-c)(2b-c-a)(2c-a-b)=27abc if a+b+c = 0
b) 1. (2- ω)(2- ω2)+ 2. (3- ω)(3- ω2) +3 (4- ω)(4- ω2)+…………+(n-1)(n- ω)(n- ω2) = {n2(n+1)2/4 } – n
5.If sin α +sin β + sin γ = cos α +cos β + cos γ = 0 then show that ,
Σcos 3α = 3 cos (α+β+γ) and Σsin 3α = 3 sin (α+β+γ)
6. prove that tan (i ln {(a-ib)/(a+ib)} = 2ab/a2-b2
7. if iz3+z2-z + i = 0 then show that IzI = 1
8. If IzI = 1 then prove that arg(z2+conj z) = ½ arg (z)
9.If α, β are the roots of the equation x2-2x+4=0 prove that αn+βn = 2n+1 cos ).
10. Construct an equation whose roots are nth power of roots of equation x2-2x cos θ +1 =0
11.If x=eiθ and 2) = nc-1` then prove that 1+c cos θ = (1+nx)(1+)
12. prove that I1-conj Z1Z2I2 - IZ1 – Z2I2 = (1-IZ1I2)(1 – IZ2I2)
13. If ABC is atriangle and triangles BCX , CAY , ABZ are drawn on BC , CA , AB , directly similar to one another . Provce that the centroid of XYZ and ABC coincides.
14. IF z = x+iy and w= , IwI = 1 , then find the locus of z.
15.If ii^i^i^……n = A+iB principle values only being considered then prove that
a) tan πA = B/A
b) A2+B2 = e-π B
16.let Z1 and Z2 be the roots of the equation z2+ pz+q = 0 , where the coefficient p and q may be complex number . Let A and B represents Z1 and Z2 respectively . If P2 = 4q cos2α/2
P2 = 4q cos2α/2
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