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

If `cos theta + cos 2theta + cos 3theta = 0` then `theta =`

A

`(2n+1)(pi)/4, 2n pi +-(2pi)/3, n inZ`

B

`(2n+1)(pi)/3, 2npi +-(pi)/4, n in Z`

C

`(2n+1)(pi)/6, 2n pi +-(2pi)/3, n in Z`

D

`(2n+1)(pi)/3, 2n pi +-(2pi)/3, n in Z`

Text Solution

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The correct Answer is:
A
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AAKASH SERIES-TRIGNOMETRIC EQUATIONS-PRACTICE SHEET (EXERCISE -I LEVEL -I STRAIGHT OBJECTIVE TYPE QUESTIONS)
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  8. If cos x cos 2x cos 3x=1//4, then x=

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  9. Solution of cot^(2)theta+[sqrt(3)+1/(sqrt(3))]cot theta+1=0 is

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  10. {x inR: cos2x+2cos^(2)x=2} =

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  11. The general solution of sin^(2)x-2cosx+(1)/(4)=0 is

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  12. The solution of the equation sec theta - cosec theta =4/3 is

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  14. If 3 cos x ne 2 sin x, then the general solution of sin^(2) x - cos 2x...

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  15. Solve 2sin^(2)x+sin^(2)2x=2

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  16. IF cos theta ne 0, and sec theta-1=(sqrt2-1) tan theta then theta=

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  17. If 4 cot 2 theta=cot^(2)theta-tan^(2)theta then theta=

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  18. The solution of 4 sin^(2) x + tan^(2) x + cosec^(2) x + cot^(2) x - 6 ...

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  19. If tan theta + tan 2theta = tan 3theta, then theta =

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  20. Which of the following is true for z=(3+2i sin theta)//(1-2 i sin thet...

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