
With L` Hospital`s Rule ( ( tan x ) ` = 1/ cos^2 x ) :

=
2
It’s not the best but i tried, i don’t get it but i hope it helped
1 - Subtraction property of equality
2 - simplify
3 - addition property of equality
4 - simplify?
5 - division property of equality
6 - distributive property
The fewest number of expressions is 3.