$y =\operatorname{sin}^{−1}( \sqrt { 1 - x } )$

$y=\frac { 2 \operatorname { cos } x } { \sqrt { 1 + x ^ { 2 } } }$

$y = xe^{\operatorname{sec} x}$

$\operatorname{ln} y = x \operatorname{ln} x$