With more than one question you need to make separate posts.

To find the limit `lim_{x->pi/2}{tan x}/{3(x-pi/2)}` , we can use L'Hopital's rule.

Start with the limit

`lim_{x->pi/2}{tan x}/{3(x-pi/2)}` take out the factor 3

`=1/3lim_{x->pi/2}{tan x}/{x-pi/2}` take derivative of numerator and denominator

`=1/3lim_{x->pi/2}{sec^2 x}/1` replace sec with 1/cos

`=1/3...

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With more than one question you need to make separate posts.

To find the limit `lim_{x->pi/2}{tan x}/{3(x-pi/2)}` , we can use L'Hopital's rule.

Start with the limit

`lim_{x->pi/2}{tan x}/{3(x-pi/2)}` take out the factor 3

`=1/3lim_{x->pi/2}{tan x}/{x-pi/2}` take derivative of numerator and denominator

`=1/3lim_{x->pi/2}{sec^2 x}/1` replace sec with 1/cos

`=1/3 lim_{x->pi/2} 1/{cos^2x}` but this is 1/0

=undefined.

**The limit is undefined.**