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If t a n A"\ "="\ "cot B , prove that...

If `t a n A"\ "="\ "cot B` , prove that `A+B=90o`

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RD SHARMA-TRIGONOMETRIC RATIOS-All Questions
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  2. If tan2theta=cot(theta+6o) , where 2theta and theta+6o are acute an...

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  3. If t a n A"\ "="\ "cot B , prove that A+B=90o

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  4. If sec5A=cos e c\ (A+36^@) , where 5A is an acute angle, find the va...

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  5. If s e c4A=cos e c(A-20^@) , where 4A is an acute angle, find the ...

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

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

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

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

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

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

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

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

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

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

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

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

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  18. Prove that: tan20otan35otan45otan55otan70o=1

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

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

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