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Illegal function

thread552-273100

Illegal function

Illegal function

(OP)
I'm trying to plot the graph of f(x)but keep getting an illegal function value.
I have defined x & f(x) & don't know why it's happening.

Is someone able to have a look please. Thank you.

x interval is [0,1.5] & y is [0,8] but this is also not displaying correctly :/

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