原帖由： TheLastMillennial ,
Yes, the calculator throws a fit when you try to calculate a Y value using an X value that’s beyond the window range. To fix this, I believe you need to zoom out by pressing [zoom] then press . You can also just adjust your window range. Or even let the calculator decide what the best window range will by pressing [zoom] then  (it’s not ''great'' at deciding, but normally it gives a good range) Also, a small tip, [trace] can do the same function as the ‘value’ option under [calc]. Just press [trace], then press [X,T,'''θ''' ,n]. The prompt for you to enter a value will appear.