Using gradient decent find the minimum of the function,

f$($x$)=$ x$21$

$+$ x$22$

$-$

x$1$

$10$

$+$ cos$(2$x$1)$;

starting at the location x $=[-0$:$5$; $0$:$75]$T $,$ and with a constant value $=0$:$01.$

a$.$ What is the location of the minimum you found?

b$.$ Is this location the global minimum?