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The roots of the equation 4x^2-2sqrt5x+1...

The roots of the equation `4x^2-2sqrt5x+1=0` are

A

`sin36^(@) , sin18^@`

B

`sin18^(@) , sin36^@`

C

`sin36^(@) , cos18^@`

D

`cos18^(@) , sin36^@`

Text Solution

Verified by Experts

The correct Answer is:
B
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AAKASH SERIES-MULTIPLE & SUBMULTIPLE -PRACTICE SHEET (EXERCISE - II) (LEVEL - I) (Straight Objective Type Questions)
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  2. 32sin^(6) 15^@ -48 sin^(4) 15 ^(@) + 18 sin^2 15^@ =

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  3. If cos alpha+ cos beta= a, sin alpha+ sin beta= b and alpha- beta= 2 t...

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  4. If 0 lt x lt pi and cos x + sin x=1/(2) , then tanx =

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  5. sin "" (2pi)/(7) + sin "" (4pi)/(7) + sin "" (8pi)/(7) =

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  6. If sin""(pi)/18 sin""(5pi)/18 sin""(7pi)/18 =

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  7. If cos theta (1) = 2 cos theta (2), then tan (( theta (1) + theta (2)...

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  8. sin^4""(pi)/16+sin^4""(3pi)/16+sin^4""(5pi)/16+sin^4""(7pi)/16=

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  9. The roots of the equation 4x^2-2sqrt5x+1=0 are

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  10. If theta(1) and theta2 are two values lying in [0,2pi] for which tan t...

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  11. cot 15^@ + cot 75^@ + cot 135^@ =

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  12. cot7(1^@)/2-cot37(1^@)/2-cot52(1^@)/2+cot82(1^@)/2 =

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  13. If sin x + "cosec"x + tan y + cot y = 4 where x and y in (0,(pi)/2) ta...

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  14. The value of cot(7pi)/16 + 2cot(3pi)/8 + cot(15pi)/16 is:

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  15. cos ^(3) x sin 2x= sum (x=0) ^(n) a (r) sin (rx) AA x in R, then

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  16. Let f(n)(theta)= tan""(theta)/2(1+sectheta)(1+sec2theta)(1+sec4theta)....

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  17. cos{(2pi)/(2^(64)-1)}cos{(2^2pi)/(2^(64)-1)}......cos{(2^(64)pi)/(2^(6...

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  18. If theta=pi/(2^n+1) then cos theta cos 2 theta cos 2^(2) theta...... ...

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  19. If sinx + cos x = sqrt7/2 where x in 1^(st) quadrant , then tan""(x)/2...

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  20. cosx=(2cosy-1)/(2-cosy) , where x , y in (0,pi) then tan""x/2 cot""(y)...

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