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If `cosalpha+2cosbeta+3cosgamma=sinalpha+2sinbeta+3singamma=0` then the value of `sin 3alpha+8sin3beta+27sin 3gamma`, is

A

`sin(alpha+beta+gamma)`

B

`3sin(alpha+beta+gamma)`

C

`18sin(alpha+beta+gamma)`

D

`sin(alpha+2beta+3gamma)`

Text Solution

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The correct Answer is:
c
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OBJECTIVE RD SHARMA-COMPLEX NUMBERS -Exercise
  1. If (a1+ib1)(a2+ib2).....(an+ibn)=A+iB, then (a1^2+b1^2)(a2^2+b2^2).......

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  2. If (a(1)+ib(1))(a(2)+ib(2))………………(a(n)+ib(n))=A+iB, then sum(i=1)^(n) ...

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  3. If cosalpha+2cosbeta+3cosgamma=sinalpha+2sinbeta+3singamma=0 then the ...

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  4. If alpha,beta,gamma are the cube roots of p, then for any x,y,z (x al...

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  5. Prove that t a n(i(log)e((a-i b)/(a+i b)))=(2a b)/(a^2-b^2)(w h e r ea...

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  6. Find the relation if z1, z2, z3, z4 are the affixes of the vertices of...

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  7. The locus of the points representing the complex numbers z for which |...

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  8. For n=6k, k in z, ((1-isqrt(3))/(2))^(n)+((-1-isqrt(3))/(2))^(n) has t...

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  9. The product of all values of (cosalpha+isinalpha)^(3//5) is

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  10. If C^(2)+S^(2)=1, then (1+C+iS)/(1+C-iS) is equal to

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  11. The center of a square ABCD is at z=0. The affix of the vertex A is z(...

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  12. The number of solutions of the system of equations "Re(z^(2))=0, |z|=2...

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  13. The vector z=-4+5i is turned counter clockwise through an angle of 180...

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  14. The value of [sqrt(2)(cos(56^(@)15^('))+isin(56^(@)15^('))]^(8), is

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  15. Find the complex number z satisfying the equations |(z-12)/(z-8i)|=5/...

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  16. The vertices B and D of a parallelogram are 1-2i and 4-2i If the diago...

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  17. If for complex numbers z(1) and z(2), arg z(1)-"arg"(z(2))=0 then |z(1...

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  18. The join of z(1)=a+ib and z(2)=1/(-a+ib) passes through

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  19. If z1, z2, z3, z4 are the affixes of four point in the Argand plane, z...

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  20. The value of sum(r=1)^(8)(sin(2rpi)/9+icos(2rpi)/9), is

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