HP 39gs Graphing manual Example x = cost and y = sint, Polar, Another sequence, such as Un 1

symbolic views of the aplets in the following table. See “Aplet view configuration” on page 1-18 for further information.

Aplet	Use this aplet to explore:
name
Function	Real-valued, rectangular functions y in
	terms of x. Example: y = 2x2 + 3x + 5 .
Inference	Confidence intervals and Hypothesis
	tests based on the Normal and
	Students-t distributions.
Parametric	Parametric relations x and y in terms of
	t. Example: x = cos(t) and y = sin(t).
Polar	Polar functions r in terms of an angle θ.
	Example: r = 2 cos (4θ) .
Sequence	Sequence functions U in terms of n, or
	in terms of previous terms in the same or
	another sequence, such as Un – 1 and
	Un – 2 . Example: U1 = 0 , U2 = 1
	and Un = Un – 2 + Un – 1 .
Solve	Equations in one or more real-valued
	variables. Example: x + 1 = x2 – x – 2 .
Finance	Time Value of Money (TVM)
	calculations.
Linear	Solutions to sets of two or three linear
Solver	equations.
Triangle	Unknown values for the lengths and
Solver	angles of triangles.
Statistics	One-variable (x) or two-variable (x and
	y) statistical data.

In addition to these aplets, which can be used in a variety of applications, the HP 39gs is supplied with two teaching aplets: Quad Explorer and Trig Explorer. You cannot modify configuration settings for these aplets.

A great many more teaching aplets can be found at HP’s web site and other web sites created by educators, together with accompanying documentation, often with student work sheets. These can be downloaded free of

Getting started 1-13