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AonZ

Let t = tan x/2 write cos^2 (x/2) as 1/ sec^2 (x/2) and hence show that cos x = 1- t^2 / 1+t^2

  • 10 months ago
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  1. primeralph
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    did this in high school........long time agooooooo.

    • 10 months ago
  2. primeralph
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    |dw:1370147814899:dw|

    • 10 months ago
  3. primeralph
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    |dw:1370147962686:dw|

    • 10 months ago
  4. AonZ
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    wow you are good!! :)

    • 10 months ago
  5. AonZ
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    thanks yet again!!! :D

    • 10 months ago
  6. primeralph
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    Thank you. Had a good teacher in high school......even though was probably the only one who understood what he was teaching........

    • 10 months ago
  7. AonZ
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    where are you from? im from sydney australia

    • 10 months ago
  8. primeralph
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    HS or college?

    • 10 months ago
  9. primeralph
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    I'm African, but I live in US.

    • 10 months ago
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