undefined
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The square root of any negative is undefined
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equals
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Square root of 1 is one
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the square root of a function will only be defined for values where the function is positive.
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the sum or product of functions will only be defined when both functions are defined.
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This function is 1 for d units left and right of x=f, and -1 everywhere else.
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negative 10
10
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negative 10
10
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Just play around with the sliders.
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This is 1 for those conditions and undefined everywhere else.
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We can multiply this chunk by any function we like, and it'll apply a domain restriction.
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