Question

f (x, y, z) = e ^ (3x +4 y) cos 5z with respect to x d/dx ---> 3e^(3x+4y)cos(5z) then the other variables do not behave as constants?
then the other variables do not behave as constants? then (Y) would not be zero

Answer 1

yes, it wouldnt be 0

Answer 2

thank you love suzi .-. .. but if it is integrated with respect to x for example the other two variables are taken as zero?

Answer 3

3 cos 5z integral (e^(3x+4y)) dx , woulnt be 0

Answer 4

mmm ok!!