exam flashcards
1
Q
polar form
A
r(cosx+isinx)
2
Q
1 in polar form
A
1=cos2pi+isin2pi
3
Q
integers
A
Z (-2, -1, 0, 1, 2)
4
Q
natural numbers
A
N -positive integers (1, 2, 3)
5
Q
whole numbers
A
W (0, 1, 2, 3)
6
Q
real numbers
A
R -every number (rational and irrational)
7
Q
contradiction
A
assume conjecture is false
8
Q
A’= -A
A
skew symmetric matrix
9
Q
skew symmetric matrices always have
A
0s in the lead diagonal
10
Q
redundancy means
A
there is an infinite number of solutions
11
Q
cosecx=
A
1/sinx
12
Q
cotx=
A
1/tanx
13
Q
cos^2x-sin^2x=
A
cos2x
14
Q
f’’(x)>0
A
minimum t.p.
15
Q
f’’(x)<0
A
maximum t.p.
16
Q
2sin^2x=
A
1-cos2x
17
Q
If’(x).f(x)=
A
1/2(f(x))^2+c
18
Q
2cos^2x=
A
1+cos2x
19
Q
sin2x=
A
2sinxcosx
20
Q
displacement =
A
|(x(t))^2+(y(x))^2|
21
Q
direction=
A
tana= dy/dt / dx/dt
22
Q
tanx=0/1
A
0
23
Q
tanx=0/-1
A
pi
24
Q
if A=A’
A
the matrix is symmetrical
25
A+B=
A’+B’
26
co prime
having no positive factors in common aside from 1
27
Itanx/cosx=
secx
28
(n-2)!=
(n-2).(n-3)!
