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If costheta =-1/2 and 0 lt theta lt 360^...

If `costheta =-1/2` and `0 lt theta lt 360^(@)`, then the value of `theta` are

A

`120^(@), 210^(@)`

B

`120^(@),300^(@)`

C

`60^(@), 240^(@)`

D

`120^(@), 240^(@)`

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The correct Answer is:
D
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AAKASH INSTITUTE-TRIGNOMETRIC FUNCTIONS -Assignment section-A (Objective Type Questions (One option is correct))
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  2. The value of (secA + tanA-1) (sec A -tanA+1) -2tanA is equal to

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  3. If costheta =-1/2 and 0 lt theta lt 360^(@), then the value of theta a...

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  4. sin10 5^(@)+cos10 5^(@)=

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  5. If sintheta(1)sintheta(2)+sintheta(3), then cos theta(1)+cos theta(2)+...

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  6. The value of cos 10^@ - sin 10^@ is

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  7. Calculate the value of (i) sin 15^(@) " "(ii) cos 15^(@)" "(...

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  8. If tan theta=1/2 and tan phi =1/3, then the value of theta + phi is

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  9. cot(pi/4+theta)cot(pi/4-theta)"i s"

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  10. The value of sin50^(@) - sin70^(@)+sin10^(@) is equal to

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  11. The value of sin(45^(@)+theta) - cos(45^(@)-theta) is

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  12. If cos(alpha+beta)=(4)/(5) and sin(alpha-beta)=(5)/(13) , where alpha ...

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  13. The value of (1-tan^(2)15^(@))/(1+tan^(2)15^(@)) is

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  14. If (1+tantheta)(1+tanphi)=2, then theta + phi=

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  15. Find the value of cos 12^(@)+cos 84^(@)+cos 156^(@)+cos 132^(@)

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  16. The value of sin 50^(@) - sin70^(@) + sin 10^(@) is equal to

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  17. The value of sinpi/18+sinpi/9+sin(2pi)/9+sin(5pi)/18 is

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  18. The value of sin""(pi)/(10)sin""(13pi)/(10) is

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  19. In a triangleABC, if sinA - cosB = cos C, then the measured of angleB ...

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  20. The value of cos1^(@) cos 2^(@) ..............cos179^(@) is

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