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math guide - 34.22

• These can also be related to complex exponents,

cos θ

=

ejθ

+ ejθ

sin θ

=

ejθ

e

jθ

---------------------

2

---------------------

 

 

 

 

 

 

2j

 

34.3.2Hyperbolic Functions

The basic definitions are given below,

sinh ( x)

=

ex ex

=

hyperbolic sine of x

-----------------

 

 

2

 

 

 

 

 

 

 

 

 

 

cosh ( x)

=

ex + ex

=

hyperbolic cosine of x

-----------------

 

 

2

 

 

 

 

 

 

 

 

 

 

tanh ( x)

 

sinh ( x)

 

ex

ex

 

 

=

------------------

=

-----------------

=

hyperbolic tangent of x

cosh ( x)

e

x

+ e

x

 

 

 

 

 

 

 

 

 

csch ( x)

 

1

 

 

 

 

2

 

 

 

 

 

=

-----------------

=

-----------------

=

hyperbolic cosecant of x

sinh ( x)

e

x

e

x

 

 

 

 

 

 

 

 

 

 

 

sech ( x)

 

1

 

 

 

 

2

 

 

 

 

 

=

------------------

=

-----------------

=

hyperbolic secant of x

cosh ( x)

e

x

+ e

x

 

 

 

 

 

 

 

 

coth ( x)

 

cosh ( x)

 

ex

+ ex

 

 

=

------------------

=

-----------------

=

hyperbolic cotangent of x

sinh ( x)

e

x

e

x

 

 

 

 

 

 

 

 

 

• some of the basic relationships are,

math guide - 34.23

sinh ( –x) = – sinh ( x) cosh ( –x) = cosh ( x) tanh ( –x) = – tanh ( x) csch ( –x) = – csch ( x) sech ( –x) = sech( x) coth ( –x) = – coth ( x)

• Some of the more advanced relationships are,

( cosh x) 2 – ( sinh x) 2 = ( sech x) 2 + ( tanh x) 2 = ( coth x) 2 – ( csch x) 2 = 1

sinh ( x ±

y)

= sinh ( x) cosh ( y) ± cosh ( x) sinh ( y)

cosh ( x ±

y)

= cosh ( x) cosh ( y) ± sinh ( x) sinh ( y)

tanh ( x ±

y)

tanh ( x) ± tanh ( y)

= 1----------------------------------------------± tanh ( x) tanh ( y)

• Some of the relationships between the hyperbolic, and normal trigonometry functions are,

sin ( jx) = j sinh ( x) cos ( jx) = cosh ( x) tan ( jx) = j tanh ( x)

j sin ( x) = sinh ( jx) cos ( x) = cosh ( jx) j tan ( x) = tanh ( jx)

34.3.2.1 - Practice Problems

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