Hyperbolic functions

Question 1

cos^2(x) + sin^2(x) = 1

Answer 1

cosh^2(x) - sinh^2(x) = 1

Question 2

1 + tan^2(x) = sec^2(x)

Answer 2

1 - tanh^2(x) = sech^2(x)

Question 3

1 + cot^(x) = csc^2(x)

Answer 3

1 - coth^2(x) = - csch^2(x)

Question 4

sinh(2x)

Answer 4

2sinh(x)cosh(x)

Question 5

cosh(2x)

Answer 5

cosh^2(x) + sinh^2(x)
2sinh^2(x) + 1
2cosh^2(x) - 1