Trig Identities Flashcards
1
Q
Reciprocal Identity : sinθ =
A
1/cscθ
2
Q
Reciprocal Identity : cosθ =
A
1/secθ
3
Q
Reciprocal Identity : tanθ =
A
1/cotθ
4
Q
Quotient Identity: tanθ =
A
sinθ/cosθ
5
Q
Quotient Identity: cotθ =
A
cosθ/sinθ
6
Q
Pythagorean Trig Identity: sin²θ + cos²θ =
A
1
7
Q
Pythagorean Trig Identity: 1 + cot²θ =
A
csc²θ
8
Q
Pythagorean Trig Identity: tan²θ + 1 =
A
sec²θ
9
Q
odd functions
A
sin(-x) = -sin(x)
csc(-x) = -csc(x)
tan(-x) = -tan(x)
cot(-x) = -cot(x)
10
Q
even functions
A
cos(-x) = cos(x)
sec(-x) = sec(x)
11
Q
Cofunction : sin(90°-x) =
A
cos(x)
12
Q
Cofunction : cos(90°-x) =
A
sin(x)
13
Q
Cofunction : tan(90°-x) =
A
cot(x)
14
Q
Cofunction : csc(90°-x) =
A
sec(x)
15
Q
Cofunction : sec(90°-x) =
A
csc(x)
