Question

partial derivatives of:

f(x,y,z) = xCos(y-z)

Answer 1

have you tried this one yet?

Answer 2

if y and z were constants (just like numbers) what would be the derivative of this with respect to x ?

Answer 3

yeah i tried it i just i wanted to see if i got it right

Answer 4

i just don't know how to do sin(k)

Answer 5

sin(k)=(a constant)
what did you get?

Answer 6

oh fine, here...\[\frac{\partial f}{\partial x}=(1)\cdot=\cos (y-z)=\cos (y-z)\]\[\frac{\partial f}{\partial y}=-x\sin(y-z)\cdot(1)=-x\sin(y-z)\]\[\frac{\partial f}{\partial z}-x\sin(y-z)\cdot(-1)=x\sin(y-z)\]