All Trig Identities

Question 1

Identity with cosh and sinh

Answer 1

Cosh^2x - sinh^2 x = 1

Question 2

Identity with tanh and sech

Answer 2

1 - tanh^2 x = sech^2 x

Question 3

Identity with coth^2

Answer 3

Coth^2 - 1 = cosech^2

Question 4

Sinh2x

Answer 4

2sinhxcoshx

Question 5

Cosh 2x - all three

Answer 5

Cosh^2 x + sinh^2 x
2cosh^2 x - 1
1 + 2sinh^2 x

Question 6

Tanh 2x

Answer 6

2tanhx / 1 + tanh^2 x

Question 7

Sec^2 x

Answer 7

1 + tan^2 x

Question 8

Cosec^2 x

Answer 8

1 + cot^2x

Question 9

Sin2x

Answer 9

2sinxcosx

Question 10

Cos 2x

Answer 10

Cos^2x - sin^2x
1 - 2sin^2x
2cos^2x -1

Question 11

Tan2x

Answer 11

2tanx / 1 - tan^2x