Maclaurin Series: Show that ln(e^2x + e^-2x ) is equal to a + bx^2 (Part ii only)

I'd really appreciate an explanation for part ii :,) Thanks in advance!

do i do it on a graph?

step-by-step explanation:

find the magnitude of the trig term  

csc

(

x

)

−

1

by taking the absolute value of the coefficient.

1

find the lower bound of the range.

tap for more

y

=

−

2

find the upper bound of the range.

tap for more

y

=

0

the range is  

y

≤

−

2

or  

y

≥

0

.

(

−

∞

,

−

2

]

∪

[

0

,

∞

)

{

y

|

y

≤

−

2

,

y

≥

0

}

step-by-step explanation:

at least two

step-by-step explanation: