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manojbalaji1

if x and y are two real quantities, then show that the equation cosy= x + 1/x is impossible.

  • one year ago
  • one year ago

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  1. shivam_bhalla
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    Simply because -1<= cosx <=1

    • one year ago
  2. shivam_bhalla
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    x--> any variable :) In your case,it's y

    • one year ago
  3. kevinkeegan
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    |dw:1336390482629:dw||dw:1336390511645:dw|

    • one year ago
  4. shivam_bhalla
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    Take LCM of x+ 1/x and you will see that cosy is always greater than 1

    • one year ago
  5. shivam_bhalla
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    or lesser than -1

    • one year ago
  6. UnkleRhaukus
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    what if both x and y are complex/

    • one year ago
  7. him1618
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    use AM>GM

    • one year ago
  8. him1618
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    ull get x+ 1/x > 2

    • one year ago
  9. him1618
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    and cos y <=1

    • one year ago
  10. him1618
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    so they can ne ver be equated

    • one year ago
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