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Cant solve this problem: Find f+g and f-g of f(x) = sqrt(1+x) and g(x)=sqrt(1-x). I know that to some ...?

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it looks easy but i cant solve it.

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  1. f(x) = √(1+x)

    g(x) = √(1-x)

    f+g = √(1+x) + √(1-x)

    f-g = √(1+x) - √(1-x)

    That's it.

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