trig identities Flashcards
1
Q
sin²+cos²
A
1
2
Q
1+tan²x
A
sec²x
3
Q
1+cot²x
A
csc²x
4
Q
sin(-x)
A
-sin(x)
5
Q
cos(-x)
A
cos(x)
6
Q
tan(-x)
A
-tan(x)
7
Q
sin(A+B)
A
sinAcosB+cosAsinB
8
Q
sin(A-B)
A
sinAcosB-cosAsinB
9
Q
cos(A+B)
A
cosAcosB-sinAsinB
10
Q
cos(A-B)
A
cosAcosB+sinAsinB
11
Q
tan(A+B)
A
tanA+tanB/1-tanAtanB
12
Q
tan(A-B)
A
tanA-tanB/1+tanAtanB
13
Q
sin(2x)
A
2sinxcosx
14
Q
sin(2x)
A
2sinxcosx
15
Q
cos(2x)
A
cos²x-sin²x
16
Q
sin²x
A
1/2-1/2cos2x
17
Q
cos²x
A
1/2+1/2cos2x
18
Q
sin(π/2-x)
A
cosx
19
Q
cos(π/2-x)
A
sinx
20
Q
sinAsinB
A
1/2cos(A-B)-1/2cos(A+B)
21
Q
cosAcosB
A
1/2cos(A-B)+1/2cos(A+B)
22
Q
sinAcosB
A
1/2sin(A-B)+1/2sin(A+B)
23
Q
cosh²x-sinh²x
A
1
24
Q
tanh²x+sech²x
A
1
25
Q
1-tanh²x
A
sech²x
26
Q
1-coth²x
A
-csch²x
