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If cos theta + cos 2 theta + cos 3 theta...

If `cos theta + cos 2 theta + cos 3 theta = 0`
then the general value of `theta` is

A

`theta = 2m pi pm 2pi //3`

B

`theta = 2m pi pm pi//4`

C

`theta = mpi + (-1) ^(n) 2pi //3`

D

`theta = m pi + (-1) ^(n) pi //3 `

Text Solution

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The correct Answer is:
A
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DISHA PUBLICATION-TRIGONOMETRIC FUNCTIONS -EXERCISE-1
  1. If cos7theta=costheta-sin4theta, then the general value of theta is

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  2. General solution of tan 5 theta =

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  3. If cos theta + cos 2 theta + cos 3 theta = 0 then the general value ...

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  4. Domain of the function f (x) = sqrt ((1)/( sin x )-1) is

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  5. The solution of tan ^(2) 9x = cos 2x -1 is

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  6. The number of points of intersection of the two curves y=2 sin x and...

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  7. If sqrt3tan2theta+sqrt(3)tan3theta+tan2thetatan3theta=1 then the gener...

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  8. If sin(pi cos theta) = cos(pi sin theta), then of the value cos(th...

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  9. The number of solutions of the equation sin((pix)/(2sqrt3))=x^2-2sqrt3...

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  10. If : sin 5x + sin 3x + sin x = 0, where 0 lt x le (pi)/2, then : x =

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  11. the general solution of sin^2thetasectheta+sqrt3 tantheta=0 is

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  12. The solution set of the system of equations x+y=(2pi)/3,cosx+cosy=3/2,...

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  13. The number of points of intersection of the curves 2y =1 " and " y = "...

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  14. If pn = cos^n theta + sin^n theta then pn - p(n-2) = k p(n-4) where k

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  15. In the interval [-pi/2,pi/2] the equation log(sin theta)(cos 2 theta)=...

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  16. In a triangle tan A+ tan B + tan C=6 and tan A tan B= 2, then the valu...

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  17. In triangle ABC, /C=90^@ then (a^2-b^2)/(a^2+b^2)=

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  18. In a triangle ABC, let 2a^2+4b^2+ c^2= 2a(2b + c) , then which of the ...

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  19. The value of 1/(r(1)^(2))+1/(r(2)^(2))+1/(r(2)^(3))+1/(r^(2)), is

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  20. In two triangle ABC and DEF, AB= DE ,BC=DF and AC =Ef then

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