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If tantheta=(20)/(21) , show that (1-...

If `tantheta=(20)/(21)` , show that `(1-sintheta+costheta)/(1+sintheta+costheta)=3/7`

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RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS-All Questions
  1. If 8tanA=15 , find sinA-cosA

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  2. If 3costheta-4sintheta=2costheta+sintheta , find tantheta .

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  3. If tantheta=(20)/(21) , show that (1-sintheta+costheta)/(1+sintheta...

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  4. If cos e c\ A=2 , find the value of 1/(tanA)+(sinA)/(1+cosA)

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  5. If /A and /B are acute angles such that cos A=cos B . then show tha...

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  6. If angleA and angleP are acute angle such that tanA=tanP, then show th...

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  7. In a /\A B C , right angled at A , if tanC=sqrt(3) , find the valu...

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  8. State whether the following are true or false. Justify your answer. ...

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  9. State whether the following are true or false. Justify your answer. ...

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  10. Evaluate each of the following in the simplest form: sin60ocos30o+co...

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  11. Evaluate the following expressions: (i) 2sin^2 30^otan60^o-3cos^2 60...

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  12. Evaluate the following expressions: (i) 4cot^2 45o-sec^2 60^o + sin^...

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  13. Evaluate each of the following: (sin^2 45^o + cos^2 45^o)/(tan^2 60^...

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  14. Evaluate each of the following: (sin60^o)/(cos^2 45^o)-cot30^o + 15c...

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  15. Show that: 2(cos^2 45°+tan^2 60°)-6(sin^2 45°-tan^2 30°)=6 (ii) 2(...

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  16. Solve each of the following equations when 0^0 < theta<90^0 ...

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  17. Solve each of the following equations when 0 < theta<90 (i) 2sin^2t...

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  18. Find the value of theta in each of the following: (i)2sin2theta=sqrt(3...

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  19. If A=30^@ verify that cos3A=4cos^3A-3cosA

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  20. If x=30^@ , verify that : (i) tan2x=(2tanx)/(1-tan^2x) (ii) sinx=sqr...

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