So y one is gonna be 20 times sine of x squared divided by 35, close parentheses, minus, open parentheses, you have negative 0.04 times t to the third power, or sorry, so I'll write times x, x to the third power plus 0.4 times x squared plus 0.96 times x, and then I can close these parentheses. So does that make sense? 20 times sine of x squared divided by 35 minus negative 0.04 x to the third plus 0.4 x squared plus 0.96 times x. All right, there you go. I have defined y one. And now I can use that to evaluate different things. So let me now go back here.