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Evaluate : (2sin68^0)/(cos22^0)-(2cot15...

Evaluate : `(2sin68^0)/(cos22^0)-(2cot15^0)/(5tan75^0)-(3tan45^0tan20^0tan40^0tan50^0tan70^0)/5`

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RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS-All Questions
  1. Evaluate : cos e c(65^0+theta)-sec(25^0-theta)-tan(55^0-theta)+cot(...

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  2. Evaluate : tan7^0tan23^0tan60^0tan67^0tan83^0

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  3. Evaluate : (2sin68^0)/(cos22^0)-(2cot15^0)/(5tan75^0)-(3tan45^0tan20^...

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  4. Evaluate : ((3cos55^0) / (7sin35^0))-(4/7)(cos70^0cos e c20^0)/(tan5^0...

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  5. Prove the following: (cos(90^0-theta)sec(90^0-theta)t a ntheta)/(cosec...

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  6. Prove the following: (tan(90^0-A)cotA)/(cos e c^2A)-cos^2A=0

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  7. Prove the following: sinthetasin(90^0-theta)-costhetacos(90^0-theta)=...

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  8. In a /\A B C , right angled at B , if A B=4 and B C=3 , find all t...

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  9. In a /\A B C , right angled at B , if A B=12 and B C=5 , find: (i) ...

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  10. If sinA=3/5 , find cosA and tanA .

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  11. If costheta=8/(17) , find the other five trigonometric ratios.

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  12. In a right triangle A B C right angled at B, if sinA=3/5 , find a...

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  13. If sinA=1/3, evaluate cosA\ cosec\ A+tanAsecA.

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  14. In a right triangle A B C , right angled at C , if tanA=1 , then...

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  15. If secalpha=5/4, evaluate (1-tanalpha)/(1+tanalpha).

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  16. If sintheta=1/2, show that (3costheta - 4cos^3theta)=0

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  17. If tanA=2 , evaluate secAsinA+tan^2A-cos e c\ A .

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  18. Given /\ A C B right angled at C in which A B=29\ u n i t s , B C=21...

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  19. If cotB=(12)/5 , prove that tan^2B-sin^2B=sin^4Bsec^2B .

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  20. If secalpha=5/4 , verify that (tanalpha)/(1+tan^2alpha)=(sinalpha)/...

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