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The function phi(x) is defined as follow...

The function `phi(x)` is defined as follows:
`phi(x)=4, " when x is rational "`,
`=-4," when x is irrational "`.
Find `phi(0),phi(2.4),phi(sqrt(3)),phi(3.6),phi(pi), phi(e) and phi(sin(pi/(4))).`

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Verified by Experts

The correct Answer is:
`4;4;(-4);4;(-4);(-4);(-4)`
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