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Flashcards in Trig Identities Deck (29):
1

cos^2(x)=

1-sin^2(x)
Or
(1+cos(2x))/2

2

Cos(x+y)=

Cos(x)cos(y)-sin(x)sin(y)

3

Cos(2x)

Cos^2(x)-sin^2(x)

4

Sin(2x)

2sin(x)cos(x)

5

Integral of sin(x)

-cos(x)

6

Integral of cos(x)

Sin(x)

7

Integral of tan(x)

ln|sec(x)|

8

Integral of sec

ln|sec(x)+tan(x)|

9

Integral of cot(x)

ln|sin(x)|

10

Integral of csc(x)

-ln|csc(x)+cot(x)|

11

sec^2(x)

tan^2(x)+1

12

tan^2(x)

sec^2(x)-1

13

csc^2(x)

1+cot^2(x)

14

cot^2(x)

csc^2(x)-1

15

cos^-1(x)

sec(x)

16

sin^-1(x)

csc(x)

17

Sin^2(x)=

1-cos^2(x)
Or
(1-cos(2x))/2

18

Integral of sec^2(x)

tan(x)

19

Integral of tan^2(x)

tan(x)-x

20

a^2-a^2*sin^2(x)=

a^2*cos^2(x)

21

a^2+ a^2tan^2(x)=

a^2*sec^2(x)

22

a^2*sec^2(x)-a^2=

a^2*tan^2(x)

23

Tan

Opp/adj

24

Cos

Adj/hyp

25

Sin

Opp/hyp

26

1/sin^2(x)

csc^2(x)

27

Integral of csc^2(x)

-cot(x)+C

28

1/sec^2(x)

cos^2(x)

29

Sin(2x)/2

sin(x)cos(x)