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Which of the following is possible?...

Which of the following is possible?

A

`cos theta = x + 1/x`

B

`sec theta = (x^(2))/(1+x^(2))`

C

`cosec theta = (x)/(1+x^(2))`

D

`tan theta = (x^(2)+x+1)/(x^(2)-3x+5)`

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AAKASH SERIES-TRIGONOMERTIC RATIOS-EXERCISE- II
  1. If sin A , cos A and tan A are in G.P. then cot^(6) A- cot^(2) A =

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  2. sin^(2) theta = ((x+y)^(2))/(4xy) is true if and only if

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  3. Which of the following is possible?

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  4. If y=cos^(2) theta + sec^(2) theta , theta != n pi, n in Z then

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  5. If tan 35^(@) +cot 37^(@) +tan 325^(@)=x tan 53^(@)+ tan 127^(@) then ...

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  6. sin^(2) 5^(@)+sin^(2) 10^(@) +sin^(2)15^(@)+...+sin^(2) 180^(@)=

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  7. If K is a positive integer then sin(alpha + pi) + Sin(alpha + 2pi) + S...

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  8. cos theta + cos ( pi + theta ) + cos (2pi + theta) + ...+2n terms =

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  9. sin^(4) theta + 2 sin^(2) theta (1-(1)/("cosec"^(2) theta ) )+ cos^(4)...

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  10. cos^(2) 5^(@) + cos^(2) 10^(@) +cos^(2) 15^(@)+...+cos^(2)360^(@)=

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  11. In Delta ABC, cos""((B+2C+3A)/(2))+ cos""((A-B)/(2))=

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  12. The ratio between (1+cos alpha)/(sin^(2) alpha) and a+((1+cos alpha)/(...

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  13. If theta = (pi)/(21), then (sin23 theta-sin 7 theta)/( sin2 theta + si...

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  14. If 1+sin theta + sin^(2) theta + ...oo= 4+2sqrt(3), 0 lt theta lt pi a...

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  15. If ( sin x + cos x)/(cos^(3)x)=a tan^(3)x+b tan^(2)x+c tan x+d then ...

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  16. If sin^(4) theta + cos^(4) theta = l + 3 +k sin^(2) theta cos^(2) thet...

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  17. If 4 sin theta + 3 cos theta =5 then tan theta =

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  18. If sqrt(sin x)+ cos x = 0 then sin x =

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  19. sin^(2) x=1-sinx then cos^(4)x+cos^(2)x=

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  20. If cos x + cos^(2) x =1 , " then " sin^(12) x + 3 sin^(10)x + 3sin^(8...

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