Casio fx-50F 1G(LOOK) 0 3 : S='(s ( s– a ) ( s –, kBuilt-inFormula List, ax2 + bx + c = 0 (a ≠ 0, b2 − 4ac ≧ 0), a = b2 + c2 − 2bc cosθ, Important, No. 02 Cosine Theorem

A Displaying a Built-in Formula

While inputting values for the variables of a formula, you can display the formula by pressing 1G(LOOK).

(Value Input Screen) a 0

1G(LOOK) 0 3 : S='(s ( s– a ) ( s –

•If the formula is too long to fit 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.

kBuilt-in Formula List

No. 01 Quadratic Equation Solution

Solves a quadratic equation using values you specify for a, b, and c.

ax2 + bx + c = 0 (a ≠ 0, b2 − 4ac ≧ 0)

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.

a = b2 + c2 − 2bc cosθ (b, c > 0, 0˚< θ ≦ 180˚)

No. 03 Heron’s Formula

Determines the area (S) of a triangle when the lengths of its three sides (a, b, c) are known.

S= (s − a)(s − b)(s − c) , s= (a + b + c)

2

(a + b > c > 0, b + c > a > 0, c + a > b > 0)

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.

P（x）

P(x) =	1	∫−∞x	e−	t2	dt
				2
	2 π
(0 ≦ x < 1 ⋅ 1050)					x

Important!

Since this is an estimate formula, proper precision may not be obtainable.

E-58