I don't know where I've went wrong here. It pops up with "missing } inserted" and I'm not entirely sure what is wrong. It is happening after the "or" part of the code. When i have (x'(t))^2 by itself under the square root it works but when I add the y'(t) bit it doesn't. This is within a table btw.
\(\int_{x_1}^{x_2} {\sqrt{1+{(f'(x))}^2}}\,\mathrm{d}x\) or \(\int_{t_1}^{t_2}
{\sqrt{{({x'(t)})}^{2}+{({y'(t)})}^{2}}\,\mathrm{d}t\)
}
) after the lastt
.