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sqrt3 cot20^(@)-4cos20^(@)=...

`sqrt3 cot20^(@)-4cos20^(@)=`

A

0

B

1

C

`-1`

D

4

Text Solution

Verified by Experts

The correct Answer is:
B
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AAKASH SERIES-MULTIPLE & SUBMULTIPLE ANGLES-PRACTICE EXERCISE
  1. If xcostheta=ycos(theta+120^(@))=z cos (theta+240^(@)) then xy+yz+zx=

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  2. 1/(sin10^(@))-sqrt3/(cos10^(@))=

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  3. sqrt3 cot20^(@)-4cos20^(@)=

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  4. cos^(2)(theta-45^(@))+cos^(2)(theta+15^(@)-cos^(2)(theta-15^(@))=

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  5. If 4 sin(60^(@) + theta ) sin (60^(@) - theta )-1=k cos 2 theta , th...

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  6. cos6^(@) cos42^(@) cos66^(@) cos78^(@) =

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  7. Show that sin""(pi)/5.sin""(2pi)/5.sin""(3pi)/5.sin""(4pi)/5=5/16.

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  8. cos (pi/7) cos ((2pi)/(7) ) cos ( (4pi )/(7) ) =

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  9. "sin"pi/14" sin"(3pi)/14" sin"(5pi)/14" sin"(7pi)/5=

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  10. "sin"^(2)pi/8" + sin"^(2)(3pi)/8" + sin"^(2)(5pi)/8" + sin"^(2)(7pi)/8...

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

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  12. Show that (1+ cos. (pi)/(8))(1+cos. (3pi)/(8))(1+ cos. (5pi)/(8))(1+ c...

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  13. If A=2 sin^(2) theta - cos 2 theta , then

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  14. If x+y+z =xyz, then sum(2x)/(1-x^(2))=

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  15. If xy+yz+zx=1 , then sum(x+y)/(1-xy)=

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  16. If sqrt(1+sinA)+sqrt(1-sinA)=2"sin"A/2" then"A/2 in

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  17. If A=340^(@) then 2 sin A//2=

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  18. I : If 180^(@) lt theta lt 270^@ , sin theta = -3//5 " then " cos the...

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  19. If A=cos^(2)10^(@)+cos^(2)50^(@)+cos^(2)70^(@), B="sin"^(4)(3pi)/8-"...

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  20. If A=(2sinx)/(sin3x)+(tanx)/(tan3x), B=cos10^(@)cos30^(@)cos50^(@)cos...

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