рд╣рд┐рдВрджреА

If ЁЭЬФ is a complex cube root of unity, find the value of (1+ЁЭЬФ)тБв(1+ЁЭЬФ2)тБв(1+ЁЭЬФ4)тБв(1+ЁЭЬФ8)

Advertisements
Advertisements

рдкреНрд░рд╢реНрди

If `omega` is a complex cube root of unity, find the value of `(1 + omega)(1 + omega^2)(1 + omega^4)(1 + omega^8)`

рдпреЛрдЧ
Advertisements

рдЙрддреНрддрд░

ω is a complex cube root of unity

∴ ω3 = 1 and 1 + ω + ω2 = 0

Also, 1 + ω2 = -ω, 1 + ω = -ω2 and ω + ω2 = –1

(1 + ω)(1 + ω2)(1 + ω4)(1 + ω8)

= (1 + ω)(1 + ω2)(1 + ω)(1 + ω2)        ...[тИ╡ ω3 = 1, ∴ ω4 = ω]

= (- ω2) (- ω) (- ω2) (- ω)

= ω6

= (ω3)2

= (1)2  

= 1

shaalaa.com
  рдХреНрдпрд╛ рдЗрд╕ рдкреНрд░рд╢реНрди рдпрд╛ рдЙрддреНрддрд░ рдореЗрдВ рдХреЛрдИ рддреНрд░реБрдЯрд┐ рд╣реИ?
рдЕрдзреНрдпрд╛рдп 3: Complex Numbers - EXERCISE 3.3 [рдкреГрд╖реНрда рекреи]

APPEARS IN

рдмрд╛рд▓рднрд╛рд░рддреА Mathematics and Statistics (Commerce) Part 1 [English] Standard 11 Maharashtra State Board
рдЕрдзреНрдпрд╛рдп 3 Complex Numbers
EXERCISE 3.3 | Q 2) v) | рдкреГрд╖реНрда рекреи

рд╕рдВрдмрдВрдзрд┐рдд рдкреНрд░рд╢реНрди

If ω is a complex cube root of unity, find the value of (1 + ω2)3


If x = a + b, y = αa + βb and z = aβ + bα, where α and β are the complex cube roots of unity, show that xyz = a3 + b3.


If ω is a complex cube root of unity, then prove the following:  (a + b) + (aω + bω2) + (aω2 + bω) = 0.


Find the value of ω18


If ω is a complex cube root of unity, show that (a + b) + (aω + bω2) + (aω2 + bω) = 0


If ω is a complex cube root of unity, find the value of (1 − ω − ω2)3 + (1 − ω + ω2)3


If , where α and β are the complex cube-roots of unity, show that xyz = a3 + b3.


Find the equation in cartesian coordinates of the locus of z if |z – 3| = 2


Find the equation in cartesian coordinates of the locus of z if `|("z" + 3"i")/("z" - 6"i")|` = 1


Answer the following:

If ω is a complex cube root of unity, prove that (1 − ω + ω2)6 +(1 + ω − ω2)6 = 128


If ω is the cube root of unity then find the value of `((-1 + "i"sqrt(3))/2)^18 + ((-1 - "i"sqrt(3))/2)^18`


Which of the following is the third root of `(1 + i)/sqrt2`? 


If α, β, γ are the cube roots of p (p < 0), then for any x, y and z, `(xalpha + "y"beta + "z"gamma)/(xbeta + "y"gamma + "z"alpha)` = ______.


Simplify the following and express in the form a + ib.

`(3i^5 + 2i^7 + i^9)/(i^6 + 2i^8 + 3i^18)`


If w is a complex cube root of unity, show that, `((a + bw + cw^2))/(c + aw + bw^2) = w^2`


If w is a complex cube-root of unity, then prove the following:

(ω2 + ω − 1)3 = −8


If w is a complex cube root of unity, show that `((a + bw + cw^2))/(c+aw+bw^2) = w^2`


If ω is a complex cube-root of unity, then prove the following :

(ω2 + ω − 1)3 = − 8


If w is a complex cube root of unity, show that `((a + bw + cw^2))/(c + aw + bw^2) = w^2`


Share
Notifications

Englishрд╣рд┐рдВрджреАрдорд░рд╛рдареА


      Forgot password?
Use app×