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Evaluate the following: (i) (sin21o)/...

Evaluate the following: (i) `(sin21o)/(cos69o)` (ii) `(tan10o)/(cot80o)` (iii) `(sec11o)/(cos e c\ 79o)`

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RD SHARMA-TRIGONOMETRIC RATIOS-All Questions
  1. If s e c4A=cos e c(A-20^@) , where 4A is an acute angle, find the ...

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  2. Evaluate the following: (i) (sin20^@)/(cos70^@) (ii) (cos19^@)/(sin71^...

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  3. Evaluate the following: (i) (sin21o)/(cos69o) (ii) (tan10o)/(cot80o...

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  4. Evaluate the following: (i) ((sin49o)/(cos41o))^2+((cos41o)/(sin49o...

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  5. Evaluate the following: (i) (cot40o)/(tan50o)-1/2((cos35o)/(sin55o)...

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  6. Evaluate the following: (i) (tan35o)/(cot55o)+(cot78o)/(tan12o)-1 ...

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  7. Evaluate the following: (i) cos e c\ 31o-sec59o (ii) (sin72o+cos18...

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  8. Evaluate the following: (i) sin35osin55o-cos35ocos55o (ii) tan48ot...

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  9. Express each one of the following in terms of trigonometric ratios ...

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  10. Express each one of the following in terms of trigonometric ratios ...

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  11. Express cos75o+cot75o in terms of angles between 0o and 30o .

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  12. If sin3A=cos(A-26^@) , where 3A is an acute angle, find the val...

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  13. If A ,\ B ,\ C are the interior angles of a triangle A B C , prove ...

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  14. Prove that: tan20otan35otan45otan55otan70o=1

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  15. Prove that: sin48osec42o+cos48o\ cos e c\ 42o=2

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  16. Prove that: (sin70o)/(cos20o)+(cos e c\ 20o)/(sec70o)-2cos70o\ cos ...

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  17. Prove that: (cos80^@)/(sin10^@)+cos59^@\ cosec\ 31^@=2

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  18. If sintheta=cos(theta-45o) , where theta and theta-45o are acute an...

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

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  20. If 2theta+45o and 30o-theta are acute angles, find the degree measu...

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