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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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Evaluate the following: (i) sin35osin55o-cos35ocos55o (ii) tan48otan23otan42otan67o (iii) sec50osin40o+cos40ocos e c\ 50o

Evaluate : (i) (sin18^@)/(cos72^@) (ii) (tan26^@)/(cot64^@) (iii) cos48^@-sin42^@ (iv) c o s e c 31^@sec59^@

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Evaluate the following: (i) 4/(cot^2 30o)+1/(sin^2 60o)-cos^2 45o (ii) 4(sin^4 30o+cos^2 60o)-3(cos^2 45o-sin^2 90o)-sin^2 60o

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RD SHARMA ENGLISH-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) ((sin49^@)/(cos41^@))^2+((cos41^@)/(sin4...

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  5. Evaluate the following: (i) (cot40^@)/(tan50^@)-1/2((cos35^@)/(sin55...

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  6. Evaluate the following: (i) (tan35^@)/(cot55^@)+(cot78^@)/(tan12^@)-...

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  7. Evaluate the following: (i) cos e c\ 31^@-sec59^@ (ii) (sin72^@+cos...

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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 o...

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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: tan20^@tan35^@tan45^@tan55^@tan70^@=1

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  15. Prove that: sin48^@sec42^@+cos48^@\ cos e c\ 42^@=2

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  16. Prove that: (sin70^@)/(cos20^@)+(cos e c\ 20^@)/(sec70^@)-2cos70^@\ ...

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

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  18. If sintheta=cos(theta-45^@) , where theta and theta-45^@ are acute a...

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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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