# Math

posted by
**Max 2**
.

1) Given that f(x,y)=xy/x^2+y^2, hence show that f(xy) = f(yx)

2) use the mean value theorem to determine the value of c, given that f(x) = cos5x

posted by
**Max 2**
.

1) Given that f(x,y)=xy/x^2+y^2, hence show that f(xy) = f(yx)

2) use the mean value theorem to determine the value of c, given that f(x) = cos5x