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If x/a costheta+y/b sintheta=1 and x/a s...

If `x/a costheta+y/b sintheta=1` and `x/a sintheta-y/bcostheta=1` Prove that : `(x^2)/(a^2)+(y^2)/(b^2)=2`

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RD SHARMA ENGLISH-TRIGONOMETRIC IDENTITIES-All Questions
  1. prove-that-1-cota-tana-sina-cosa-seca-cosec-2a-coseca-sec-2a-sinatana-...

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  2. If x=asectheta+btantheta and y=atantheta+bsectheta ,prove that : x^2...

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  3. If x/a costheta+y/b sintheta=1 and x/a sintheta-y/bcostheta=1 Prove...

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  4. If cos e ctheta-sintheta=a^3,sectheta-costheta=b^3, Prove that : a^2b...

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  5. Ifacos^3theta+3acosthetasin^2theta=m and asin^3theta+3acos^2thetasin^...

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  6. If 3sintheta+5costheta=5, then show that 5sintheta-3costheta=+-3.

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  7. If acostheta+bsintheta=m and asintheta-bcostheta=n , Prove that a^2...

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  8. If costheta+cos^2theta=1, Prove that: sin^(12)theta+3sin^(10)theta+3si...

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  9. If cottheta=15/8, then Evaluate ((2+2sintheta)(1-sintheta))/((1+costhe...

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  10. Prove the trigonometric identities: (tantheta)/(1-cottheta)+(cottheta)...

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  11. If sintheta+costheta=x , Prove that : sin^6theta+cos^6theta=(4-3(x^2-1...

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  12. Prove the following identities: ((1+sintheta)^2+(1-sintheta)^2)/(co...

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  13. Prove that (1-sintheta+costheta)^2=2(1+costheta)(1-sintheta)

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  14. Prove the following identities: (sinA+secA)^2+(cos"A"+"c o s e cA")^2=...

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  15. Prove the identity: (1+tanAtanB)^2+(tan"A"-tan"B")^2=sec^2Asec^2B

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  16. Prove the following identities: 2(sin^6theta+cos^6theta)-3(sin^4theta+...

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  17. Prove the following identities: tan^2A-tan^2B=(cos^2B-cos^2A)/(cos^2Bc...

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  18. If costheta+sintheta=sqrt(2)costheta, show that costheta-sintheta=sqrt...

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  19. If tantheta+sintheta=m and tantheta-sintheta=n , show that m^2-n^2= 4...

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  20. if (secA+tanA)(secB+tanB)(secC+tanC)=(secA-tanA)(secB-tanB) (secC-t...

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