a.
b.
Domain is (-¥
, ¥ )
Domain is (-¥,
¥ )
Range is [2,
¥
)
Range is (-¥,
¥ )
c.
Domain is (-¥
, ¥ )
Range is [- 1, 1]

So, the slope of the tangent line
is 0. This means that the tangent line is horizontal. Since it goes through
the point (1, 81), the equation of the tangent line is y = 81.
a.
b.
c.
d.
e.
f.