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If sin^2theta + sin^ 4theta = 1, then p...

If `sin^2theta + sin^ 4theta = 1`, then prove that `cos^2theta+ costheta= 1`

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KALYANI PUBLICATION-RELATIONS BETWEEN TRIGONOMETRIC RATIOS AND RELATED IDENTITIES-EXERCISE
  1. Prove the following (sintheta +cosectheta) ^2+(costheta+sectheta) ^2=7...

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  2. If (sec A + tan A)(sec B + tan B)(sec C + tan C) = (sec A- tan A)(sec ...

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  3. If sin^2theta + sin^ 4theta = 1, then prove that cos^2theta+ costheta...

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  4. If tan^4theta - tan^2 theta= 1, then prove that cos^4theta+ cos^2theta...

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  5. If 3 tantheta+ cottheta =5cosec theta, then prove that costheta=1/2

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  6. If 7 sin^2theta + 3 cos^2 theta= 4, then prove that tantheta = 1/s...

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  7. If cosectheta + cottheta= k, then prove that costheta=(k^2-1) /(k^2+1)

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  8. If tantheta+ cot theta = 2, then prove that tan^10theta + cot^10 theta...

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  9. If sintheta + cosectheta= 2, then prove that sin^100theta + cosec^100 ...

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  10. If sintheta - costheta = 1, then prove that sintheta + costheta =+-1

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  11. If cos^2theta- sin^2theta= tan^2 phi, then prove that cos^2phi – sin^2...

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  12. If tantheta=(sinalpha-cosalpha)/(sinalpha+cosalpha)then prove that sqr...

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  13. If tan^2alpha = 1 + tan^2beta,then prove that cos^2 beta = cot^2alpha

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  14. If a costheta -b sin theta = c,then prove that a sintheta + b costheta...

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  15. If sintheta +costheta =sqrt(2) costhetathen prove that costheta -sint...

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  16. If tantheta +sintheta=mand tantheta-sintheta=nprove that m^2-n^2=4sqrt...

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  17. Show that (a+b) ^2=4ab cos^2theta is possible if a=b

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  18. Eliminate theta x=r costheta, y=r sintheta

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  19. Eliminate theta and phi x sintheta=a, y tantheta=b

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  20. Eliminate theta, x=a cos^3theta,y=b sin^3theta

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