Page 18 - BUKU KALIN (bismillah Fix)_Bab 6

2
(sinh −1 ) 1 √1 + +
= . ( )
+ √1 + 2 √1 + 2

(sinh −1 ) + √1 + 2
= ( )
( + √1 + )√1 + 2
2

(sinh −1 ) 1
=
√1 + 2

2
. cosh −1 = ln ( + √ − 1 )

Jelas

2
(cosh −1 ) |ln ( + √ − 1 ) )|
=

(cosh −1 )

2
2
|ln ( + √ − 1 )| ( + √ − 1 )
= .
2
( + √ − 1)
2
(cosh −1 ) 1 √ − 1 +
= . ( )
( + √ − 1 ) √ − 1
2
2
(cosh −1 ) 1
=
√ − 1
2