hp 39g+ (39g & 40g)_mastering the hp 39g+_English_E_F2224-90010

The default axes under the Trig option is 2

−

to 2

. If you are primarily

interested in the first 2π of the graph then simply change Xmin to zero.

Alternatively you can move the cursor to

(the middle) and then zoom in.

The example below uses zoom factors of 2x2 with Recenter: ed.

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

decimal

place means that the resulting trig values will be ‘wrong’ in the

to 15

decimal place depending on the function used.