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Show that :- 2[cos^4 60^@+sin^4 30^@]-[...

Show that :- `2[cos^4 60^@+sin^4 30^@]-[tan^2 60^@+cot^2 45^@]+3sec^2 30^@=1/4` .

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Show that :- 2[cos^2 45^@+tan^2 60^@]-6[sin^2 45^@-tan^2 30^@]=6 .

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Evaluate The following : (5 cos^2 60^@+ 4 sec^2 30^@ -tan^2 45^@)/(sin^2 30^@+ cos^2 30^@)

Evaluate :- 2sin^2 60^@+cot^2 30^@-tan 45^@ .

Prove that : ((sin 0^@+ cos30^@)(sin30^@+tan45^@))/((tan 30^@+ cot 60^@)(sec 60^@-cosec90^@))=9/8 .

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Find x , if 2 cosec^2 30^@+xsin^2 60^@-3/4 tan^2 30^@ = 10 .

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MBD-INTRODUCTION TO TRIGONOMETRY-EXERCISE
  1. Find x if :- sin(20^@+x)=cos60^@ .

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  2. Find x if :- if cos (40+x)=sin30^@. Find the value of x.

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  3. Show that :- 2[cos^4 60^@+sin^4 30^@]-[tan^2 60^@+cot^2 45^@]+3sec^2 ...

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  4. Show that :- 2[cos^2 45^@+tan^2 60^@]-6[sin^2 45^@-tan^2 30^@]=6 .

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  5. Find the value theta in the following :- 2sin2theta=sqrt3 .

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  6. Find the value theta in the following :- 2cos3theta=1 .

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  7. Find the value theta in the following :- sqrt3 tan2theta-3=0 .

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  8. Find the value theta in the following :- tan3theta=sin45^@ cos45^@+sin...

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  9. Find the value theta in the following :- costheta=cos60^@ cos30^@ +sin...

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  10. Find the value theta in the following :- sin2theta=sin60^@cos30^@-cos...

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  11. Ifsin(A-B)= sin A cosB-cos A sin B and cos(A-B) = cosA cosB + sin A si...

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  12. Express cot 85^@ + cos 75^@ in terms of trigonometric ratios of angles...

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  13. Without using Trigonometric tables, evaluate:- 2(sin43^@)/(cos47^@)-(c...

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  14. Without using Trigonometric tables, evaluate:- (cos^2 20^@+cos^2 70^@)...

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  15. Without using Trigonometric tables, evaluate:- 2(cos67^@)/(sin23^@)-(t...

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  16. Evaluate : (sin70^@)/(cos 20^@)+(cosec36^@)/(sec54^@)-(2cos43^@cosec47...

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  17. Evaluate : (tan20^@)/(cot70^@) +(cot50^@)/(tan40^@)+(sin^2 20^@+sin^2 ...

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  18. Without using Trigonometric Tables evaluate the following :- sinthetac...

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  19. Evaluate : tan 15^@ tan25^@tan60^@tan65^@tan75^@ .

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  20. Evaluate : tan65^@/cot25^@ .

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