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The value of (tan 80^@ - tan 10^(@))/( t...

The value of `(tan 80^@ - tan 10^(@))/( tan 70^(@))`

A

2

B

`-2`

C

4

D

`-4`

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The correct Answer is:
A
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DIPTI PUBLICATION ( AP EAMET)-TRIGONOMETRIC RATIOS AND IDENTITIES -EXERCISE 1 B ( COMPOUNDS ANGLES )
  1. If (1- tan2^(@) cot 62^(@))/( tan 152^(@) - cot88^(@))=ksqrt(3) , then...

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  2. ((1+ tan 32^@)(1+tan 13^(@)))/((1+tan23^(@))(1+tan22^(@)))=

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  3. The value of (tan 80^@ - tan 10^(@))/( tan 70^(@))

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  4. (tan alpha + tan beta )/( tan (alpha + beta ))+(tan alpha - tan beta )...

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  5. If sin ( theta + alpha ) = cos ( theta + alpha ), then tan theta =

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  6. If tan(A+B)=m , tan (A-B)=n, " then " tan 2A=

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  7. If tan (A+B)=p , tan (A-B)=q , " then " cot 2B=

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  8. If tan theta1= k cot theta2 " then " (cos (theta1- theta2))/(cos(thet...

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  9. If tan A =18//17 , tan B=1//35 then tan (A-B)=

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  10. If tan(pi//4 + theta ) + tan (pi//4 - theta ) =3 , " then " tan^(2)(p...

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  11. If tan""[(pi)/4 + theta ]+tan[(pi)/(4)- theta ]=a " then " tan^(3)[(pi...

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  12. If cos alpha + cos beta =0 = sin alpha + sin beta " then " cos (alpha...

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  13. If tan theta =(cos 12^@ + sin 12^(@))/(cos 12^(@)-sin12^(@)) " then "...

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  14. If tan 20^@ =p , " then " (tan 160^@ - tan 110^(@))/(1+ tan 160^(@) ta...

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  15. If 0 lt theta lt pi//2 and 2 sin theta = sqrt(3) cos 10^(@) + sin 10^(...

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  16. If A+B=pi//2 then tan B+ 2 tan (A-B)=

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  17. If A+B=135^(@) " then " (1+ cot A ) (1+cot B)=

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  18. If A+B=45^(@), then prove that (i) (1+ tan A) (1+ tan B) =2 (ii) (cot...

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  19. If A+B=225^(@) than prove that (cot A)/(1+cotA). (cot B)/(1+cotB)=(1)/...

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  20. If alpha + beta = 3pi//4 " then " (1- tan alpha ) (1- tan beta ) =

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