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Evaluate the following: (i) sec50^osin...

Evaluate the following: (i) `sec50^osin40^o + cos40^o\ cos e c\ 50^o` (ii) `sec70^osin20^o-cos20^o\ cos e c\ 70^o`

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RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS-All Questions
  1. In /\P Q R , right-angled at Q ,\ P Q=3c m and P R=6c m . Determine ...

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  2. Evaluate the following: (i) (cos80^o)/(sin10^o)+cos59^o\ cos e c\ 31...

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  3. Evaluate the following: (i) sec50^osin40^o + cos40^o\ cos e c\ 50^o ...

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  4. Prove that: (i) sin35 sin55-cos35 cos55=0 (ii) (cos70)/(sin20)+(co...

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

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  6. Express each of the following in terms of trigonometric ratios of an...

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  7. Evaluate the following: (i) ((sin35)/(cos55))^2+((cos55)/(sin35))^2-...

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  8. Evaluate: ((sin47^@)/(cos43^@))^2+((cos43^@)/(sin47^@))^2-4cos^2 45^@

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

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  10. Find theta; if sin(theta + 36^@) = cos theta; where theta + 36^@ is a...

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  11. If tan2theta=cot(theta+6^@) , where 2theta and theta+6^@ are acute a...

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  12. If t a n A=cot B , prove that A+B=90^@

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

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

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

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

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  17. Evaluate the following: (i) ((sin49^@)/(cos41^@))^2+((cos41^@)/(sin4...

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

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

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

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