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Tan20^(@) + Tan25^(@) + Tan20^(@)Tan25^(...

`Tan20^(@) + Tan25^(@) + Tan20^(@)Tan25^(@)`

A

-1

B

0

C

1

D

2

Text Solution

Verified by Experts

The correct Answer is:
C
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AAKASH SERIES-COMPOUND ANGLES-PRACTICE EXERCISE
  1. If Tan70^(@) - Tan20^(@) = k Cot40^(@) then k =

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  2. Sin10^(@) - Sin110^(@) + Sin130^(@) =

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  3. Tan20^(@) + Tan25^(@) + Tan20^(@)Tan25^(@)

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  4. If Tan22^(@) + Tan38^(@) - sqrt(3) = k Tan22^(@) Tan38^(@) then k =

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  5. (1 - Tan 99^(@)) (1 - Tan36^(@)) =

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  6. (1+Cot78^(@)) (1+Cot57^(@))

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  7. If A + B = 135^(@) then (TanA.TanB)/((1+TanA)(1+TanB)) =

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  8. Tan ((pi)/(4)+theta).Tan((3pi)/(4)+theta)=

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  9. (tan (45^(@) + alpha ) + tan ( 45^(@) - alpha ))/( cot (45^(@) + alpha...

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  10. If tan(pi//4+ theta ) + tan(pi//4- theta )= k sec 2 theta , then th...

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  11. If Tan theta + Cot theta = 3 then Tan^(4)theta+Cot^(4)theta =

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

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  13. cos^(2) (A-B)+cos^(2)B-2cos(A-B) cos A cos B =

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  14. If alpha,beta are acute angles, sin alpha = (4)/(5), tan beta = (5)/(1...

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  15. If A,B are acute angle, tan A=5/12 , cos B=3/5 , then cos (A+B)=

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  16. If A, B are acute angles, sin A =4/5 , tan B=5/12 , then sin (A+B)=

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  17. If Tan A = (17)/(18), TanB = (1)/(35) then Cos (A+B) =

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  18. If Tan = (1)/(2), Tan B = (1)/(3) then Tan (A+B) =

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  19. If cos A =-3//5 , sin B=7//25 and 90^(@) lt A lt 180^@,0^(@) lt B lt ...

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  20. If B,A+B are acute angle , sin(A+B)=12/13, sin B=5/13 then sin A =

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