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Is it right to say that cos ( 60^(@) + 3...

Is it right to say that `cos ( 60^(@) + 30 ^(@) ) = cos 60^(@) cos 30 ^(@) -sin 60^(@) sin 30 ^(@) `

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VGS PUBLICATION-BRILLIANT-TRIGONOMETRY-EXERCISE
  1. ( 1-tan ^(2) 45^(@) )/( 1+tan ^(2) 45^(@)) =

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  19. cos 12^(0)- sin 78^(0) =

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  20. Evaluate cosec 31^(@) -sec 59^(@)

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