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Choose the correct option and justify yo...

Choose the correct option and justify your choice:(ii)`(1-tan^2 45^@)/(1+tan^2 45^@)`

A

`tan90^@`

B

1

C

`sin45^@`

D

0

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R G PUBLICATION-INTRODUCTION TO TRIGONOMETRY-EXERCISE
  1. Evaluate the following:(v)(5cos60^@+4Sec30^@-tan^2 45^@)/(Sin^2 30^@+C...

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  2. Choose the correct option and justify your choice:(i)(2 tan 30^@)/(1+t...

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  3. Choose the correct option and justify your choice:(ii)(1-tan^2 45^@)/(...

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  4. Choose the correct option and justify your choice:(iii)sin 2A=2sin A i...

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  5. Choose the correct option and justify your choice:(iv)(2 tan 30^@)/(1-...

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  6. If tan(A+B)=sqrt3 and tan(A-B)=1/sqrt3:find A and B.

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  7. State whether the following are true or false.Justify your answer:(i)s...

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  8. State whether the following are true or false.Justify your answer:(ii)...

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  9. State whether the following are true or false. Justify your answer:(ii...

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  10. State whether the following are true or false.Justify your answer:(iv)...

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  11. State whether the following are true or false.Justify your answer:(v)c...

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  12. Evaluate:(i)Sin18^@/Cos72^@

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  13. Evaluate:(ii)tan26^@/Cot64^@

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  14. Evaluate:(iii)Cos48^@-Sin42^@

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  15. Evaluate:(iv)Cosec31^@-Sec59^@

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  16. Show that:(i)tan48^@tan23^@tan42^@tan67^@=1

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  17. Show that(ii)Cos38^@Cos52^@-Sin38^@Sin52^@=0

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  18. If tan2A=cot(A-18^@)where 2A is an acute angle,find the value of A.

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  19. If tanA=cotB,prove that A+B=90^@

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  20. If sec 4A=cosec(A-20^@),where 4A is an acute angle,find the value of A...

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