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( 1-tan ^(2) 45^(@) )/( 1+tan ^(2) 45^(@...

`( 1-tan ^(2) 45^(@) )/( 1+tan ^(2) 45^(@)) = `

A

`tan 90^@`

B

1

C

`sin 45^@`

D

0

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VGS PUBLICATION-BRILLIANT-TRIGONOMETRY-EXERCISE
  1. Evaluate the following (sec^(2) 60^(@) -tan ^(2) 60^(@) )/( sin ^(2...

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  2. ( 2tan 30 ^(@) )/( 1+tan ^(2) 45^(@) ) =

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  3. ( 1-tan ^(2) 45^(@) )/( 1+tan ^(2) 45^(@)) =

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  4. (2 tan 30^(@))/( 1-tan ^(2) 30^(@)) =

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  5. Is it right to say that cos ( 60^(@) + 30 ^(@) ) = cos 60^(@) cos 30 ^...

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  6. In right angle triangle Delta PQR ,right angle at Q,PQ = 6cm and angl...

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  7. In Delta XYZ , right angle is at Y,YZ =x, and XZ =2x Then determine an...

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  8. Is it right to say that sin (A+B) =sin A +sin B ? Justify your answer...

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  9. Check and discuss the above relations in the case of angles between 0^...

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  10. Check and discuss the below relations in the case of angles between 0°...

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  11. Check and discuss the below relations in the case of angles between 0°...

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  12. Check and discuss the below relations in the case of angles between 0°...

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  13. Check and discuss the above relations in the case of angles between 0°...

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  14. Check and discuss the above relations in the case of angles between 0°...

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  15. Evaluate (sec 35^(@))/( cosec 55^(@))

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  16. If cos 7A =sin (A-6^(@)) , where 7A is an acute angle ,find the valu...

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  17. If sin A =cos B , then prove that A+B =90 ^(@)

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  18. Express sin 81^(@) +tan 81^(@) in terms of trigonometric ratio of angl...

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  19. If A , B and C are interior angles of triangle ABC ,then show that sin...

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  20. Evaluate (tan 36^(@) )/( cot 54^(@))

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