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sin^(3)20^(@)+sin^(3)40^(@)-sin^(3)80^(@...

`sin^(3)20^(@)+sin^(3)40^(@)-sin^(3)80^(@)=`

A

`(3sqrt3)/8`

B

`-(3sqrt3)/8`

C

`(3sqrt3)/2`

D

0

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The correct Answer is:
B
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AAKASH SERIES-MULTIPLE & SUBMULTIPLE ANGLES-PRACTICE EXERCISE
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  2. Sin^(2)50^(@)+Sin^(2)70^(@)+Sin^(2)170^(@)=

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  3. sin^(3)20^(@)+sin^(3)40^(@)-sin^(3)80^(@)=

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  4. cos^(4)alpha+sin^(4)alpha-6sin^(2)alpha cos^(2)alpha=

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  8. IF tan^2 theta=2 tan^2 phi +1 then find the value of cos 2 theta+sin^2...

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  9. If x in (45^(@),90^(@)), sin2x=1/2, then sin^(3)x-3/4 sinx=

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  10. If (sin alpha )/(a) = ( cos alpha )/(b) , then a sin 2alpha + b cos 2...

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  11. If log(2)(sinx)-log(2)(cosx)-log(2)(1-tanx)-log(2)(1+tanx)=-1 then tan...

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  12. tantheta+2tan2theta+4tan4theta+8tan8theta 16tan16theta+32cot32theta=

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  13. The angle theta whose cosine is equal to its tangent is given by

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  14. If tan x=(b)/(a) " then " sqrt((a+b)/(a-b))+sqrt((a-b)/(a+b))=

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  15. If alpha is a root of 25 cos^(2)theta + 5 cos theta - 12 =0, (pi)/(2) ...

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  16. A quadratic equation whose roots are tan22 1^(@)/2 and cot22 1^(@)/2 i...

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  17. A quadratic equation whose roots are tan15^(@) and cot15^(@) is

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  18. If xcostheta=ycos(theta+120^(@))=z cos (theta+240^(@)) then xy+yz+zx=

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  19. 1/(sin10^(@))-sqrt3/(cos10^(@))=

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

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