Math Help - Question on derivative

hi everyone,

Find
xyz-cos(x+y+z)=0


i am having problems with the cos(x + y + z).

Thank you in advance for all your help & support.

Originally Posted by anderson

hi everyone,

Find
xyz-cos(x+y+z)=0


i am having problems with the cos(x + y + z).

Thank you in advance for all your help & support.

What is your problems exactly in ?

hi General,

is this correct?

F(x,y,z) = xyz - cos(x + y + z)

=yz+sin(x+y+z),

i dont know how to get sin(x+y+z), u = (x + y + z),i dont know how to continue from there to get sin(x+y+z)

thank you for all your help & support.

Originally Posted by anderson

hi General,

is this correct?

F(x,y,z) = xyz - cos(x + y + z)

=yz+sin(x+y+z),

i dont know how to get sin(x+y+z), u = (x + y + z),i dont know how to continue from there to get sin(x+y+z)

thank you for all your help & support.

Sorry I will reply to this. Since General is offline.

Your is correct.

In general, If is differentiable, then:
.

Did you get it ?