Find ynfor given functions (1) x(x−1)(x−2)(x−3) (2) x2+1x(x2−1)

It seems like you've made a typo in your question. However, I'll try to answer it based on my understanding.

1. The function is a polynomial of degree 4: f(x) = x(x-1)(x-2)(x-3). To find y for a given x, simply substitute the value of x into the function. For example, if x = 1, then y = 1(1-1)(1-2)(1-3) = 0.

2. The function seems to be a rational function: f(x) = (x^2+1)/(x(x^2-1)). To find y for a given x, substitute the value of x into the function. However, note that x cannot be 0, 1, or -1 because these values would make the denominator zero, and division by zero is undefined. For example, if x = 2, then y = (2^2+1)/(2(2^2-1)) = 5/6.