Alg. 3/ Trig Winter Exam

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horizontal lines slope =

zero

vertical lines slope =

undefined

parallel lines slopes

are equal

perpendicular lines slopes

are reciprocals of each other

addition/subtraction with matrices

the dimensions have to be the same

multiplying matrices

the number of columns on the first matrix has to be equal to the number of rows of the other matrix

identity matrix

a square matrix (same number of rows and columns) with 1's along along it's main diagonal & 0's elsewhere

inverse matrix

two matrices that have a product of an identity matrix

tan is

y/x

amplitude

1st step in graphing cos/sin graphs - indicates the vertical stretch

period

2nd step in graphing cos/sin graphs - 360 / b - indicates how many waves you will see in 360 degrees

phase shift

3rd step in graphing cos/sin graphs - -c / b

vertical shift

4th step in graphing cos/sin graphs - d

sinx

0 - max - 0 - min- 0

cosx

max - 0 - min - 0 - max

d value added to sinx/ cosx

the y values on the graph

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