Casio fx-115ES PLUS - Manual (Page 44)

E-43
VctA • VctB (Vector dot product)
AVctA15(VECTOR)7(Dot)VctB=
VctA
× VctB (Vector cross product)
AVctA*VctB=
Obtain the absolute values of VctC.
A1w(Abs)VctC)=
Determine the angle formed by VctA and VctB to three decimal
places (Fix 3).
v
(cos =
(A
•
B)
A B
, which becomes = cos –1
(A
•
B)
A B
)
1N(SETUP)6(Fix)3
A(VctA15(VECTOR)7(Dot)VctB)/
(1w(Abs)VctA)1w(Abs)
VctB
))=
1c(cos
–1 )
G)=
Inequality Calculations (INEQ)
You can use the following procedure to solve a quadratic inequality or cubic
inequality.
1. Press
Nc1(INEQ) to enter the INEQ Mode.
2. On the menu that appears, select an inequality type.
To select this inequality type: Press this key:
Quadratic inequality
1(aX
2 + bX + c )
Cubic inequality
2(aX
3 + bX 2 + cX + d )
3. On the menu that appears, use keys
1 through 4 to select the inequality
symbol type and orientation.
4. Use the Coefficient Editor that appears to input coefficient values.
• To solve x 2 + 2 x – 3 < 0, for example, input the coefficients a = 1, b = 2,
c = –3 by pressing 1
= 2 =- 3 =.
4 4
VCT VCT
5 5
VCT VCT
6 6
VCT VCT
7 7
VCT FIX VCT FIX
VCT FIX VCT FIX