Find the limit of a function

Question

1.

lim {(sin^(-1)(x/2)-(π/6))/x-1}

x->1

2.

lim {(sin^(-1)(5x))/(tan^(-1)(2x))}

x->0

3.

lim ln(2x/π)tanx

x->(π/2)^(+)

I would like to know the detailed solution, please

Answer 1

desmos.com/calculator/gfzgbgiwbb

The above Desmos graph offers some hints on #2 and #3.