HP 39g Master Manual page 98

The default axes under the Trig option is 2
interested in the first 2 π of the graph then simply change Xmin to zero.
Alternatively you can move the cursor to
The example below uses zoom factors of 2x2 with Recenter:
Calculator Tip
In the graphs above the cursor is at x = π. The coordinates at
the bottom of the screen should show F1(X)=0 but doesn't due
to the fact that the value of π stored internally is not (and of
course cannot) be exact. The rounding of π in the 13
place means that the resulting trig values will be 'wrong' in the
th th
11 to 15 decimal place depending on the function used.
π π
−
to 2 . If you are primarily
π
(the middle) and then zoom in.
98
ed.
th
decimal