Help! several variables T^T
1.Find and sketch the domain of ....
a) f(x,y) = cosec(|x|+|y|) <<<i got |x|+|y|not equal to 0,pi,2pi,.... at the end but i dont know what the Df graph looks like -*-
b) f(x,y,z) = ln(16-(x^2)-(y^2)-(z^2))
2.Determine the set of points at which the function is continuous.
f(x,y)= x(sqrtx)(sqrty)/(x^2)+(y^2) if (x,y) not equal to (0,0)
= 0 if (x,y) = (0,0)
3.Find the partial derivatives of ....
a)Find fx and fy of f(x,y) = arctan(x-y)
b)Find df/dx and df/dy of f(x,y) = g(x/y)
it's my assignment and i can't do it T_T could someone plz help me....