Trignometric Identities Flashcards
1
Q
tan(θ) =
A
= sin(θ)/cos(θ)
2
Q
sin(θ)/cos(θ) =
A
tan(θ)
3
Q
cos(θ)/sin(θ) =
A
cot(θ)
4
Q
sin²(θ) + cos² =
A
1
5
Q
cot(θ)=
A
cos(θ)/sin(θ)
6
Q
1 + tan²(θ) =
A
sec²(θ)
7
Q
1 + cot²(θ) =
A
cosec²(θ)
8
Q
cot(θ) =
A
1/tan(θ)
9
Q
cosec(θ) =
A
1/sin(θ)
10
Q
sec(θ)
A
1/cos(θ)
11
Q
sin(2θ) =
A
2sin(θ)cos(θ)
12
Q
cos(2θ) =
A
cos²(θ) -sin²(θ); 2cos²(θ) -1; 1- 2sin²(θ)
13
Q
cos²(θ) -sin²(θ) =
A
cos(2θ)
14
Q
2cos²(θ) -1 =
A
cos(2θ)
15
Q
1- 2sin²(θ)
A
cos(2θ)
