⚠ (partial)/(partial x)(x^{2/3}+y^{2/3}) is read as (partial)/(partial x)*(x^{2/3}+y^{2/3}): use (...)*(...) for multiplication, use (...)^(...) for a power■(partial)/(partial x)(x^{2/3}+y^{2/3}) is read as (partial)/(partial x)(x^(2/3)+y^(2/3)): use ^(...) to group an exponent, use * to multiply