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Prove that: (i) sin35osin55o-cos35oco...

Prove that: (i) `sin35osin55o-cos35ocos55o=0` (ii) `(cos70o)/(sin20o)+(cos59o)/(sin31o)-8sin^2 30o=0`

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RD SHARMA-TRIGONOMETRIC RATIOS-All Questions
  1. Evaluate the following: (i) (cos80o)/(sin10o)+cos59o\ cos e c\ 31o ...

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  2. Evaluate the following: (i) sec50osin40o+cos40o\ cos e c\ 50o (ii)...

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  3. Prove that: (i) sin35osin55o-cos35ocos55o=0 (ii) (cos70o)/(sin20o)...

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  4. Express each of the following in terms of trigonometric ratios of a...

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  5. Express each of the following in terms of trigonometric ratios of a...

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  6. Evaluate the following: (i) ((sin35o)/(cos55o))^2+((cos55o)/(sin35o...

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  7. Evaluate: ((sin47o)/(cos43o))^2+((cos43o)/(sin47o))^2-4cos^2 45o

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

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  9. Dind theta; if sin(theta + 36^@) = cos theta; where theta + 36 is an ...

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  10. If tan2theta=cot(theta+6o) , where 2theta and theta+6o are acute an...

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

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

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

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

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

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

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

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

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

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

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