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Prove: (1-tan^2A)/(cot^2A-1)=tan^2A...

Prove: `(1-tan^2A)/(cot^2A-1)=tan^2A`

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((1+tan^(2)A)/(1+cot^(2)A))=((1-tan A)/(1-cot A))^(2)=tan^(2)A

RD SHARMA-TRIGONOMETRIC IDENTITIES-All Questions
  1. Prove that (costheta-sintheta+1)/(costheta+sintheta-1)=c o s e ctheta+...

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  2. Prove: tan^2A+cot^2A=sec^2A cos e c^2A-2

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  3. Prove: (1-tan^2A)/(cot^2A-1)=tan^2A

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  4. Prove: 1+(cot^2theta)/(1+cos e c\ theta)=cos e c\ theta

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  5. Prove: (costheta)/(cos e c\ theta+1)+(costheta)/(cos e c\ theta-1)=2ta...

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  6. Prove: (1+costheta-sin^2theta)/(sintheta(1+costheta))= cottheta

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  7. Prove: (tan^3theta)/(1+tan^2theta)+(cot^3theta)/(1+cot^2theta)=secthet...

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  8. Prove: (tantheta+1/(costheta))^2+(tantheta-1/(costheta))^2=2((1+sin^2t...

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  9. Prove the following identity: (1/(sec^2theta-cos^2theta)+1/(cos e c^2t...

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  10. Prove: ((1+sintheta-costheta)/(1+sintheta+costheta))^2=(1-costheta)/(1...

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  11. Prove: (secA+tanA-1)(secA-tanA+1)=2tanA

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  12. Prove: (1+cotA-cos e c\ A)(1+tanA+secA)=2

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  13. Prove: (cos e c\ theta-sectheta)(cottheta-tantheta)=(cos e c\ theta+se...

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  14. Prove: (secA-cos e c\ A)(1+tanA+cotA)=tanAsecA-cotA cos e c\ A .

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  15. (cosAcosecA-sinAsecA)/(cosA+sinA)=cosecA-secA

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  16. Prove: (sinA)/(secA+tanA-1)+(cosA)/(cos e c\ A+cotA-1)=1

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  17. Prove: (tanA)/((1+tan^2A)^2)+(cotA)/((1+cot^2A)^2)=sinAcosA

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  18. Prove: sec^4A(1-sin^4A)-2tan^2A=1

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  19. Prove: (cot^2A(secA-1))/(1+sinA)=sec^2A((1-sinA)/(1+secA))

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  20. Prove: sin^2Acos^2B-cos^2Asin^2B=sin^2A-sin^2B

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