Trig Identities

Question 1

Sin^2 (x) + Cos^2 (x) =

Answer 1

1

Question 2

Sec^2 (x)

Answer 2

Tan^2 (x) + 1

Question 3

Tan (x)

Answer 3

Sin (x) / Cos (x)

Question 4

Cot (x)

Answer 4

= Cos x/ Sin x

Question 5

Sec^2 (x) - tan^2 (x)

Answer 5

= 1

Question 6

Csc^2 (x) - cot^2 (x)

Answer 6

1

Question 7

Reciprocal: Sin (x)

Answer 7

1/ csc(x)

Question 8

Reciprocal: Cos (x)

Answer 8

1/ sec (x)

Question 9

Reciprocal tan (X)

Answer 9

1/cot(x)

Question 10

Reciprocal: csc(x)

Answer 10

1/sin(x)

Question 11

Reciprocal: sec (x)

Answer 11

1/cos(x)

Question 12

Reciprocal: Cot (x)

Answer 12

1/tan(x)

Question 13

E/O Iden : Sin(-x) =

Answer 13

-sin(x)

Question 14

E/O/Iden: tan(-x)

Answer 14

-tan (x)

Question 15

E/O/iden: csc(-x)

Answer 15

-csc(x)

Question 16

E/O/ iden: cos(-x) =

Answer 16

Cos (x)

Question 17

E/O/Iden: cot(-x) =

Answer 17

-cot (x)

Question 18

E/O/Iden: Sec(-x) =

Answer 18

Sec (x)

Question 19

Sin (2X)

Answer 19

2 Sin (x) Cos (x)

Question 20

Cos (2x)

Answer 20

Cos^2 (x) - Sin ^2 (x)

Question 21

Cos (2x)

Answer 21

2 Cos^2 (x) - 1

Question 22

Cos (2x)

Answer 22

1-2 sin^2 (x)

Question 23

Tan(2x)

Answer 23

( 2 tan (x)) / ( 1- tan^2 (x)

Question 24

Sin^2 (x) =

Answer 24

( 1-Cos(2x))/(1+cos (2x))

Question 25

Cos^2 (x)

Answer 25

( 1+ Cos (2x))/2

Question 26

Tan^2 (x)

Answer 26

(1- cos(2x))/(1+ cos( 2x))