If fx, y)= xcosy + ycox, then the correct answer in the following is: (a) t= ayox (b)=of 8y bx (c) Öxdy oyox o o oc o d (sin(-2 when (x, y) # u,4) is continuous

If fx, y)= xcosy + ycox, then the correct answer in the following is: (a) T= ayox (b)=of 8y Bx (c) Öxdy oyox O O Oc O d (sin(-2 when (x, y) # U,4) is continuous the k is equal to If f(x, y) =tan4(3:xy-6) k, when (x, y) = (1,2) (a) ( () (d) O a O b Oc O d