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  1. kittycat01
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    i think i have to subtitute x with acos2theta

    • 9 months ago
  2. kittycat01
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    *phew* finally done it :)

    • 9 months ago
  3. hartnn
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    try x= a than y

    • 9 months ago
  4. hartnn
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    oh! how did u do it ?

    • 9 months ago
  5. kittycat01
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    lol @hartnn there is a formula tan^-1 x+ tan^-y = (x+y)/(1-xy)

    • 9 months ago
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spraguer (Moderator)
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