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Displaying a Built-in Formula
While inputting values for the variables of a formula, you can display the formula by pressing
1
G
(LOOK).
(Value Input Screen)
1
G
(LOOK)
• If the formula is too long to fi t on the display use the
e
key to scroll to the right to view
the missing part.
• To clear the formula from the display, press
1p
(EXIT) or
A
.
k
Built-in Formula List
No. 01 Quadratic Equation Solution
Solves a quadratic equation using values you specify for
a
,
b
, and
c
.
No. 02 Cosine Theorem
For a triangle for which the lengths of two sides (
b
and
c
) and the angle (
Ƨ
) formed by them
are known, determines the length of remaining side.
No. 03 Heron’s Formula
Determines the area (
S
) of a triangle when the lengths of its three sides (
a
,
b
,
c
) are known.
No. 04 Normal Probability Function P(
x
)
Uses Hastings’ estimate formula to determine the probability of a standard normal
distribution P(
x
) illustrated below when the standardized variate (
x
) is known.
Important!
Since this is an estimate formula, proper precision may not be obtainable.
0
a
0
a
03
:
S
=
'
(
s
(
s
–
a
)(
s
–
03
:
S
=
'
(
s
(
s
–
a
)(
s
–
ax
2
+ bx + c = 0
(a ≠ 0, b
2
− 4ac 0)
ax
2
+ bx + c = 0
(a ≠ 0, b
2
− 4ac 0)
a = b
2
+ c
2
− 2bc cos
θ
(b, c > 0, 0˚< 180˚)
θ
a = b
2
+ c
2
− 2bc cos
θ
(b, c > 0, 0˚< 180˚)
θ
S = s(s − a)(s − b)(s − c) , s=
(a + b + c)
(a + b > c > 0, b + c > a > 0, c + a > b > 0)
2
S = s(s − a)(s − b)(s − c) , s=
(a + b + c)
(a + b > c > 0, b + c > a > 0, c + a > b > 0)
2
P(x) =
edt
(0 x < 1 × 10
50
)
2π
1
−∞
∫
x
2
2
t
−
P x
x
P(x) =
edt
(0 x < 1 × 10
50
)
2π
1
−∞
∫
x
2
2
t
−
P x
x