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  1. kittycat01
    • 2 years ago
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    i think i have to subtitute x with acos2theta

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

  3. hartnn
    • 2 years ago
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    try x= a than y

  4. hartnn
    • 2 years ago
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    oh! how did u do it ?

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

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