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If 4 cos theta.cos(120^(@)+theta).cos(12...

If `4 cos theta.cos(120^(@)+theta).cos(120^(@)-theta)=1//2` then `theta =`

A

`n pi` or `(3n pm 1) (pi)/(9) : n in Z`

B

`(n pi)/(3)+(-1)^(n)(pi)/(6) : n in Z`

C

`(2n pi)/(3)pm(pi)/(9) : n in Z`

D

`(n pi)/(3)+(pi)/(18) : n in Z`

Text Solution

Verified by Experts

The correct Answer is:
C
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DIPTI PUBLICATION ( AP EAMET)-TRIGONOMETRIC EQUATIONS -EXERCISE 1
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  3. If 4 cos theta.cos(120^(@)+theta).cos(120^(@)-theta)=1//2 then theta =

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  4. The sum of the solutions in (0, 2pi) of the equation cos x cos ((pi)/(...

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  5. If sin theta.sin (60+theta)sin (60-theta)=1//4 then theta =

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  6. If sin 3alpha = 4 sin alpha sin (x + alpha)sin(x-alpha), then x =

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  7. If tan theta + tan(60^(@)+theta)+tan (120^(@)+theta)=3, then theta =

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  8. If tan theta + tan 2theta + tan 3theta = 0 then theta =

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

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  10. If tan theta + tan (pi//3+theta)-tan(pi//3-theta)=3 then theta =

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  11. The solution of sin 2 theta + cos 2theta + sin theta + cos theta + 1 =...

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  12. If cos 3x + cos 2x = sin (3x//2)+sin(x//2), 0 le x le 2pi, then x =

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  13. The solution set of sin 2theta - cos 2theta - sin theta + cos theta = ...

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  14. If sin x - 3 sin 2x + sin 3x = cos x - 3 cos 2x + cos 3x then x =

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  15. If sin[(pi)/(4)cot theta]=cos[(pi)/(4)tan theta] then theta =

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  16. If tan((pi)/(2) sin theta)=cot((pi)/(2)cos theta) then sin(theta +(pi)...

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  17. If tan(picostheta)=cot(pisintheta), then prove that cos(theta-(pi)/(4...

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  18. If tan(cot x) = cot (tan x), then sin 2x =

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  19. If 1+sin x + sin^(2)x +….oo = 4 + 2sqrt(3), 0 lt x lt pi, x ne pi//2 t...

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  20. The expression (1+tan x +tan^(2)x)(1- cot x + cot^(2)x) has the positi...

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