95. This follows from Eq. 19-35 by dividing numerator and denominator by the product k

1

k

2

as shown below:

T

X

=

1

k

1

k

2

(k

1

L

2

T

C

+ k

2

L

1

T

H

)

1

k

1

k

2

(k

1

L

2

+ k

2

L

1

)

=

L

2

k

2

T

C

+

L

1

k

1

T

H

L

2

k

2

+

L

1

k

1

=

R

2

T

C

+ R

1

T

H

R

2

+ R

1

where the definition Eq. 19

− 33 has also been used.