Trig Flashcards
1
Q
Cosine Law
A
a^2=b^2+c^2-2bcCosA
2
Q
Sine Law
A
SinA/a = SinB/b = SinC/c = …
3
Q
Sin0
A
0
4
Q
Sin30
A
Root1 /2
5
Q
Sin45
A
Root2 /2
6
Q
Sin60
A
Root3 /2
7
Q
Sin90
A
Root4 /2 aka 1
8
Q
Cos0
A
Root4 /2 aka 1
9
Q
Cos30
A
Root3 /2
10
Q
Cos45
A
Root2 /2
11
Q
Cos60
A
Root1 /2
12
Q
Cos90
A
0
13
Q
Tan0
A
0
14
Q
Tan30
A
1/root3
15
Q
Tan45
A
1
16
Q
Tan60
A
Root3
17
Q
Tan90
A
Undefined
18
Q
Reciprocal identity (sin)
A
Sinx = 1/cscx
19
Q
Reciprocal Identity (cos)
A
Cosx = 1/secx
20
Q
Reciprocal identity (tan)
A
Tanx = 1/cotx
21
Q
Reciprocal identity (csc)
A
Cscx = 1/sinx
22
Q
Reciprocal identity (sec)
A
Secx = 1/cosx
23
Q
Reciprocal identity (cot)
A
Cotx = 1/tanx
24
Q
Quotient identity
A
Tanx = sinx/cosx
Cotx = cosx/sinx
25
Pythagorean identity
sin^2x + cos^2x = 1
1 + cot^2x = csc^2x
Tan^2x + 1 = sec^2x
26
Angle less than 90
Measure the sides
a >/= b, one solution
a < b, bSinA
27
a = bSinA
One solution
28
a < bSinA
No solutions
29
a > bSinA
Two solutions
30
Angle greater than/equal to 90
Measure the sides
a>b, one solution
a = b, no solutions
