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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

`2n pi +- (pi//3)`

B

`npi + (-1)^(n) cdot (2pi//3)`

C

`npi + (-1)^(n) cdot (pi//3)`

D

`2n pi +- (2pi//3)`

Text Solution

Verified by Experts

The correct Answer is:
D
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MARVEL PUBLICATION-TRIGONOMETRIC FUNCTIONS-MULTIPLE CHOICE QUESTIONS - PART - A : BUILDING-UP THE BASE
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  2. The most general value of theta satrisfying the two equations cos th...

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

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  4. General solution of the equation 2 sin^(2)x + sqrt(3) cdot cos x + 1...

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  5. If 3 tan (theta - 15^@) = tan (theta + 15^@), then the general value...

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  6. The general solution of 8 tan^(2)""(x)/(2)=1+ sec x is

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  7. General solution of the equation sin x + cos x = sqrt(2) cdot cos a...

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  8. General solution of the equation tan theta + tan 2 theta + sqrt(3) c...

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  9. General solution of the equation tan theta + tan 4 theta + tan 7 the...

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  10. Quadratic equation 8 "sec"^(2) theta - 6 "sec" theta + 1 = 0 has

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  11. Number of solutions of the equation sin 5x cdot cos 3x = sin 6x cdot...

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  12. "tan"|x| = |"tan" x|, if

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  13. Number of solutions of the equation |cot x| = cot x + csc x, where 0...

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  14. If x + cos theta = sin theta has a real solution, then

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  15. General solution of the equation 4 cot 2 theta = cot^(2) theta - tan...

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  16. If, in Delta ABC, a = 16, b = 24, c = 20, then : sin (A/2)= ....

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  17. If, in Delta ABC, a = 18, b = 24, c = 30, then : sin A= ....

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  18. If, in Delta ABC, a = 8, b = 15, c = 17. then : sin(A/2) and cos A a...

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  19. If Delta ABC, a = 18, b = 24, c = 30 then the area of the triangle i...

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  20. If, in DeltaABC, a = sqrt(2), b = sqrt(3), c = sqrt(5), then the area ...

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