рдорд░рд╛рдареА

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)`

рдмреЗрд░реАрдЬ
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
  рдпрд╛ рдкреНрд░рд╢реНрдирд╛рдд рдХрд┐рдВрд╡рд╛ рдЙрддреНрддрд░рд╛рдд рдХрд╛рд╣реА рддреНрд░реБрдЯреА рдЖрд╣реЗ рдХрд╛?
рдкрд╛рда 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
рдкрд╛рда 3 Complex Numbers
EXERCISE 3.3 | Q 2) v) | рдкреГрд╖реНрда рекреи

рд╕рдВрдмрдВрдзрд┐рдд рдкреНрд░рд╢реНтАНрди

If ω is a complex cube root of unity, find the value of (1 - ω - ω2)3 + (1 - ω + 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: (ω2 + ω - 1)3 = – 8


If ω is a complex cube root of unity, show that (2 − ω)(2 − ω2) = 7


If ω is a complex cube root of unity, show that (2 + ω + ω2)3 − (1 − 3ω + ω2)3 = 65


If ω is a complex cube root of unity, find the value of `ω + 1/ω`


If ω is a complex cube root of unity, find the value of ω2 + ω3 + ω4


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


If ω is a complex cube root of unity, find the value of (1 + ω)(1 + ω2)(1 + ω4)(1 + ω8)


If α and β are the complex cube root of unity, show that α2 + β2 + αβ = 0


Find the equation in cartesian coordinates of the locus of z if |z| = 10


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, show that, `((a + bw + cw^2))/(c + aw + bw^2) = w^2`


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, show that `((a + bω + cω^2))/(c + aω + bω^2) = ω^2`


 Find the value of `sqrt(-3)xx sqrt (-6)`


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

(w2 + w - 1)3 = - 8


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

(ω2 + ω − 1)3 = −8


Share
Notifications

Englishрд╣рд┐рдВрджреАрдорд░рд╛рдареА


      Forgot password?
Use app×