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Math Help - Inverse trigonometric function Question 3

  1. #1
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    Exclamation Inverse trigonometric function Question 3

    Prove that
    arctan x + arctan y = (1/2)arcsin [2(x+y)(1-xy)/(1+x^2)(1+y^2)]
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  2. #2
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    lets start with the LHS, we have...



    Which can be written as...



    we then use:



    to prove the statement.

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