Casio fx-9860G SD - Manual (Page 249)

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Example Draw a line that is tangent to point (2, 0) on the graph for
y = x ( x + 2)( x – 2).
Use the following V-Window settings.
Xmin = –6.3, Xmax = 6.3, Xscale = 1
Ymin = –3.1, Ymax = 3.1, Yscale = 1 (initial defaults)
Procedure
1 m GRAPH
2 !3(V-WIN) 1(INIT)J
3 !m(SET UP)cccccc1( )J
4 3(TYPE)1(Y=)v(v+c)(v-c)w
5 6(DRAW)
6 !4(SKTCH)2(Tang)
7 e~ew* 1
Result Screen
5-10-2
Changing the Appearance of a Graph
* 1 You can draw a tangent line in succession by
moving the “
” pointer and pressing w.