There are infintely many posibilities:
Any expression that contains (y-4) or a multiple of it in the denominator.
Also, the following trigonometric functions:
An expression that contains arcsin(x/y) where abs(x) < 4
Similarly arccos
Corresponding conditions for arccosec and arcsec.
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Y is undefined because the line x=1 never crosses the y axis.
y = 2x is defined everywhere (for all values of x)
The reciprocal of any expression is 1 divided by that expression.Therefore, the answer for the first part is 1/(y-3).Because of the division, this will be undefined if y-3 is equal to zero, in other words, if y = 3.The reciprocal of any expression is 1 divided by that expression.Therefore, the answer for the first part is 1/(y-3).Because of the division, this will be undefined if y-3 is equal to zero, in other words, if y = 3.The reciprocal of any expression is 1 divided by that expression.Therefore, the answer for the first part is 1/(y-3).Because of the division, this will be undefined if y-3 is equal to zero, in other words, if y = 3.The reciprocal of any expression is 1 divided by that expression.Therefore, the answer for the first part is 1/(y-3).Because of the division, this will be undefined if y-3 is equal to zero, in other words, if y = 3.
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