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If cosalpha+cosbeta=0=sinalpha+sinbeta" ...

If `cosalpha+cosbeta=0=sinalpha+sinbeta" then "cos2alpha+cos2beta`

A

`-2sin(alpha+beta)`

B

`-2cos(alpha+beta)`

C

`2sin(alpha+beta)`

D

`2cos(alpha+beta)`

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DIPTI PUBLICATION ( AP EAMET)-DE MOIVRE'S THEOREM-EXERCISE 1
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  3. If cosalpha+cosbeta=0=sinalpha+sinbeta" then "cos2alpha+cos2beta

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  4. If cosalpha+cosbeta+cosgamma=0=sinalpha+sinbeta+singamma" then "cos3al...

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  5. If cosalpha+cosbeta+cosgamma=0=sinalpha+sinbeta+singamma" then "sin3al...

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  6. If cos alpha+cosbeta+cosgamma = 0 = sinalpha + sinbeta + singamma then...

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  7. If cosalpha+cosbeta+cosgamma=0=sin alpha+sinbeta+singamma then cos^2al...

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  8. If cos alpha+cosbeta+cosgamma = 0 = sinalpha + sinbeta + singamma then...

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  9. If cosalpha+cosbeta+cosgamma=0=sinalpha+sinbeta+singamma then cos(2alp...

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  10. If cosalpha+cosbeta+cosgamma=0=sinalpha+sinbeta+singamma then sin(2alp...

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  11. If cosalpha+coabeta+cosgamma=0=sinalpha+sinbeta+singamma then cos(alph...

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  12. If a=cisalpha,b=cisbeta,c=cisgamma, and a/b+b/c+c/a-1=0 then cos(alph...

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  13. Let A and B denote the statements A:cosalpha+cosbeta+cosgamma=0" ...

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  14. The value of (i)^(i) is

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  15. log(logi)

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  16. sqrti+sqrt(-i)=

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  17. One value of (1+i)^(1//2) is 2^(1//4)e^(ipi//8).The other value is

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  18. The modulus of sqrt2i-sqrt(-2i) is

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  19. (cos""(pi)/(6)+isin""(pi)/(6))^(1//2)+(cos""(pi)/(6)-isin""(pi)/(6))^(...

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  20. If n is a multiple of 3 then omega^(n) + omega^(2n) =

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