Find the syntax and semantic errors in the following code snippet:

def equation$(a,b)$

square $=$ lambda $x$:$x^{{?}^{{?}^{?}}}x$

return square $(a,b)+(2**a**b)$

$a,b=10,3$

print$("$a $=+str(a)+,b=+str(b)$

print$("(a+b{)}^{{?}^{?}}2=",$ equation$($a$))$